Nvil is still solid and easy to learn, but you need to understand the concept of subd modeling first...otherwise the workflow wont make much sense. The workflow is meant to be fast and you can get most of your tools mapped to 3-4 keys and and then the different modifiers on the mouse buttons really make it quick.

The most powerful feature is the help feature, because you type or query any command and it will list the results...which can then be click to activate.

Its quirky, but a great app for some serious poly modeling.

Combine it with Moi and its really nice. I have just been to busy modelling to even look at the forums the last few months. Just finished a 50m polygon asset entirely modeled in Moi. The 64bit version cannot come soon enough, as I am creating quite huge assets.