Yeah, Songsterr can definitely be a bit “hit & miss” - particularly with bass transcriptions it feels like. I tend to avoid AI transcribed songs - I think Songsterr can struggle pull the bass out of the mix (particularly for older recordings), so either misses notes or mistakenly transcribes notes from other instruments.
I guess, as with other AI/online transcriptions, YMMV and it may be necessary to get tabs from elsewhere and just use Songsterr as a backing track.
Phil
I use these 2 practice exercises provided by Josh everyday, they have made a massive difference to my playing, strengthening by tendons and improving my reach. I no longer have flaring fingers and I’m all over the major and minor scales. Just 20mins then I’ll do a lesson, improvisation or learn a tune.
The lessons are set up very well. They are very well designed and structured to accommodate a wide range of skill levels. If you have other musical experience, the early modules are likely to be easy to breeze through.
My big advice though - is to not push yourself to power through the lessons too fast. If you start experiencing mental fatigue - if your brain feels full - take a break from lessons. Whether that is 10 minutes, 3 hours, or overnight.
Your brain actually processes and assimilates while resting, not practicing.
If your brain is full of lessons, but you have more time and inclination to practice, THAT is when I recommend practicing other things. Supplement the lessons and focus on skills that use less/different brainpower.
Early on, if this is easy - do several lessons or a whole module at a stretch with 5-10 minute rests in between. When you hit your limit… go one at a time. Mix it up in between.
The 12 bar blues 
A beautifully simple melodic scale,
I practice and play it everyday
12 bar blues is already in the course syllabus.
I recommend practicing it after the course introduces it.