It's about damn time!
I like the navigation controls myself, especially when using a tablet. You control everything with the 'alt' key. It takes time to get used to it, but I find it faster than most setups.
And yeah, Zbrush doesn't use the graphics card, but the CPU instead. Plus it will only go up to 4GB of Ram, it's a pain, as I have 8GB. But I don't have many lagging issues with it though. It seems to handle it's polys well. I've had about 24M in one subtool. It still worked well.
Anyway, good luck. Will be cool to see what you come up with.
"Your weapons are no match for ours! People of Mars, surrender!"
"Um, this isn't Mars. This is Earth."
"Earth? Earth-with-nuclear-weapons Earth?"
[long pause] "Friend!!"