I haven't used NetXP v3 yet but I have played a bit with v2, using it in the WinForms test programs I make to test out components. It was a pretty nice set of components at v2, v3 looks even better.
Has the documentation made an appearance yet? It was so close to non-existant in v2 that you were more-or-less forced to figure everything out via trial and error. I couldn't complain because of the price, but it was quite frustrating.