I had a Vaterra Uno and not only did it have some significant engineering &/or manufacturing errors, Vaterra decided to quit selling it very soon after it had been introduced.
Because of my experience I'll probably never buy another Vaterra product again but their scale crawler does look pretty good.
This is not to say Axial products are perfect - not at all - but nothing is perfect that I'm aware of - any kit I can remember requires either custom fitting parts, or reworking something to get it going. Then, later on, things need to be repaired &/or improved and all this is just part of what every kit builder lives with. This has been true with helicopters, airplanes, blah, blah, blah and these "problem solving challenges" are all just part of what we do.
I actually love building - maybe even more than . . . oops . . . that's another topic . . . sorry to wander off.