I use the Vox at home because the actual amp annoys my wife, but yes, it’s flimsy…you have to be careful not to bend it the wrong direction. The nice thing about them though is that you have an aux jack too…I pipe my computer into it as well so I can hear @JoshFossgreen during my lessons.
A Vox Amplug is a cheap and simple option, but since you said you’re looking for something “good” for an “advanced player”, I think it may be a bit too simple. When I think about a serious bass guitar headphone amp, I think Palmer Pocket Amp Bass, or even the Darkglass Element (if money isn’t an issue).
This. Runs on batteries, doubles as a drum machine and looper, doesn’t break the bank. I own one and love it.
It’s difficult to say and it’s depends on your budget as well. Headphones amp like Vox is really great. The next up would be a small amp like blackstar fly 3 bass he can use that as a headphones amp as well. The best on in my book would be the ashdown tone pocket but you do pay the extra for the extra. I own all 3 and like all 3. Each is solid.
Both are really great. Just keep in mind that the Darkglass Element can’t use a battery. If that wasn’t the case it would have been the best gift since sliced bread (most bass players like Darkglass). The Palmer is a great and rugged option imo. I always use that one when I take my bass somewhere else. I also like the blackstar Fly3 since the headphone out is a lot better then the Vox Amplug and you can play silently on the speaker too. Great for campfires/acoustic scenarios.
As for headphones you can pretty much hook up everything as long as it has a decent bass. We got a few threads about headphones too.