"They're probably giving a pretty bad first impression to SketchUp users with its current state."

They are. At least to this SU user. :)

In any case: I've been eager to replace SU for basic modeling with another app lately, and Bonzai ain't it. Looking forward to MOI getting layers - that'd make it the perfect substitute.

MoI certainly seems to be moving in the right direction. Keep at it!