In reality, even though I dived in somewhat late in the game, I haven’t ran into many show stoppers. Only had it crash once in nearly daily use so far, occasional glitches here and there, undocumented help features for various commands, and occasional redraw funkiness, but by an large, at least for the parts of the features I’ve used regularly it’s been quite solid.
Way more solid than EI’s modeler ever was, even on it’s second and third shipping release.
I think the biggest challenge at this point will be documentation. As one who’s never used Rhino in any form prior to this, it’s a fairly substantial learning curve, particularly in the UI front having had previous nurbs background in other apps.
I realize that the myriad of commands have been added on over the years on the windows side, but there’s a fair bit of inconsistency (understandibly so) in the naming of the commands and attemping to find them based off what one would think they might be called doesn’t always work so well. Learning this stuff sans comprehensive manual and smidgeons of web post this and out of date youTube tutorial that (which older versions often with differing names and icons for the commands) made the curve all the steeper. My main guide was an out of date V4 era book and even then the icons and names of the commands often did not match what was in the Mac version.
My guess is a fair number of your Mac buyers will be like me, first time Rhino users because they didn’t have windows and have just been waiting for a decent nurbs based alternative to what’s out there, and the differences in how the tools are laid out between the mac and windows variants makes following the mass of existing tuts and whatnot on the web a challenge, thus putting the larger burden of getting people up to speed on it back on you folks.