I see no need to sell either of my Rumble amps for now.
I can go from the truck with an amp in one hand, pedal board in the other and bass over my shoulder.
One load in to my jam night. We are living in the future 
Lightweight combos and cabs are pricey due to not only the design parameters and quality components necessary to get the performance out of them they provide put also because the cost of neodymium speakers and lightweight wood for the cabs are pretty costly compared to ceramic speakers and MDF materials or heavier plywood.
Italian speaker manufacturers and lightweight Italian poplar have solved the weight issues for bass cabs but the product isn’t inexpensive. The single Bass Array 110 cab used in my Genzler combo weighs just 19lbs/8.6kg but it also lists for $800. A 210 version lists for $1400 and a 410 for $1900. It’s tough to justify that cost if you’re not playing professionally and getting paid.
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How are the Fender Rumble amps so moderately priced and equally light then?
I’m not privy to all of the specs of the various Rumble models but I can guess at a few factors one of which is mass production. They sell far more Rumbles than others sell of their combos, where are they made and at what cost? What is the quality level of their various components? Another is domestically produced speakers spec’d individually for each amp and built for them by Eminence here in the US.
The speakers alone are a major component in the cost of any combo or speaker cab and Fender does not state that any of the Rumble combo speakers are neodymium except in the 800w version. The 500w and 40w have ceramic speakers which are far less costly and may not be as efficient as more costly speakers. That will impact the volume one gets from the power amp. Fender doesn’t provide us with a whole lot of specs on this so I can’t really say. What I can say is speakers with higher efficiency/sensitivity make better us of the power amps output and clean volume.
Compared to the Rumble series of amps from years ago these newer versions are quite good and versatile to a degree. I’ve owned a Rumble 40 and played through a Rumble 100. But they still don’t match the quality of higher end pro line gear and were never really intended to. That’s not the primary market for those amps. To get to that point you’re into the 800w version of combos and separate heads and cabs and spending $1000 and more. Those I have not played so I can’t intelligently comment on them. They may be quite good or not so good.
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Sure @soulman I’m definitely in the camp of jamming with friends on a Tuesday night crowd vs actually doing it for a living.
The guys wouldn’t care if I turned up with my Rumble or a high end amp/cab as long as I was there and keeping them somewhat in time. 
Rumbles and the Ampeg combos both of which I’ve used for similar stuff are actually perfect for this. I haven’t played any MarkBass gear so I can’t comment on it other than to know that it’s more costly. We each should own and play what suits our needs.
In my case I needed a small lightweight combo that could fill the niche you describe but also be expanded to meet other needs I may have. So my choices may be very different from yours or others and are based on having a need for more pro grade gear that provided all of the flexibility I may need now or in the future. I tend to hold onto my rigs for a very long time.
When I comment I’m only trying to address whatever question(s) are asked about differences I’m able to comment on mostly through personal experience coupled with whatever knowledge I have of specs and build quality. I always hesitate to comment on anything I haven’t used before or where I don’t have knowledge of specs and build quality.
But this much I can also say. I’ve been playing Fender bass amps for a very long time. Long before any of these SS versions were ever produced and my experiences with them and that of others is that they make one hell of a great guitar amp but never quite cut it as well as others as far as being legendary bass amps. Still, there are exceptions to that and these current Rumbles are very nice amps. They sound good and get the job done.
Yeah but if you have the KRK’s you don’t need an amp 
My 160W of JBL monitors serves me just fine, and sound awesome for bass with amp/cab sims. Haven’t wanted an amp in years.
Lol, yeah, they are pretty nuts already tbf 
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If we’re going off topic here, why did Markbass go for the “k” in Mark when they’re Italian? It’s similar to some American brands where they seem to love the letter K, and we here like “C”. I like that it says bass. The brandname… well, give me a logo instead.
And why doesn’t Markbass offer a few colour options like Orange. It can’t be a cost factor - Markbass is pricey, even if it’s good value. Sure, it cuts into the profit, but they would’ve sold one to me already, and probably won’t now.
Why are basses always in the wrong colour (except the one you have, relax 
), I mean the cheap ones come in bright red like a Ferrari and some expensive ones have weird translucent paint that looks like a half-finished bathroom…
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Colour options are not that common for bass amps. They are most often limited editions, like the Ampeg Micro VR or the purple Orange.
Eich Amps does offer custom color for the tolex. Alternatively, you can buy tolex in whatever colour you like and replace it 
TBF, there’s very little yellow on the CMB 121 besides the logo and the amp controls though (hence Black line I guess 
)
As much as I don’t really need it, probably would have another if I was looking for a 1x12 combo amp.
The volume and gain at 12 o’clock like they had it in the video further up, they were definitely feeling the bass from that!
Guy in the shop I went to played at about half the gain/volume n it had some kick! Lol