I’m a 701 user, been at it for around a year now. Modo is the best box modeller bar none, it’s quick / simple and easy to make structures at an pace…
BUT! When it comes to game specific stuff, it kind of trips over itself (I’m not sure what’s been updated in 901) the .FBX pipeline caused issues (Animations, UV’s), normal mapping bakes were wonky, Farfarer’s Vertex normal kit is good but Maya LT does it better (Smoothing groups) the material based smoothing system in Modo isn’t great. Talking about smoothing groups, in Maya you can preview a smooth mesh by pressing 1,2 or 3… Simple as that!
Trying to do a proper alpha cutout for hair is a pain and there’s no proper node based shader tree implementation, the documentation presumes you know the UI inside and out before you use it. Some specifics like colour maps / Masks requires a convoluted workflow (although easy when you know how (Select diffuse co-efficient from shader tree > Click render and set pixel size > then bake render to outputs).
UV Mapping isn’t as accurate, I had a road (all quads) with a curb. Planar mapped it and messed around for ages in Modo, with Maya I clicked a button and that was the end of the story… The auto-rig / Human IK / animation system in Maya for me anyway is far quicker and simpler to get to where I need to go and finally Modo is quite expensive really… Especially for what it is…!
I understand 3DSMax is ridiculously expensive, but I’d try Blender and Maya LT well before I’d touch Modo…