i may be a bit late to the conversation, but I use both the small version (at home) & the pro version (at work). They work great, but use them a lot more when Im in 3ds max, or when I need to get really close on my model in SU and the mouse just isnt cutting it. I honestly dont use many of the shortcut buttons on the pro version so if your on a budget, the $99 one will do just fine. Hope that helps