My first set of discs was on the bike I got back into the sport on 18 mo. ago. Mechanical discs...not top of the line by any stretch, but decent. Now I'm a convert. Sure, they weigh a little more than V's, but where I live has some pretty nasty (wet, muddy) conditions and, despite my 240# size, I've yet to have complaints about stopping with discs once I got them set up.
There is a different type of maintenance routine involved, but on the plus side, you're also not wearing away at your rims when you're grinding mud between pads and braking surface.