I also have a V-vessel and it worked great, no leaks yet. I'm relatively new to making wine but I think the idea is great, and racking the finished wine was easy after a few bottles.
It's difficult to see if you have any sediment (lees) needing to be racked, but if you rack your wine enough you'll be fine. I finished bottling six gallons of White Zinfandel about six weeks ago, which was made from a kit, and it turned-out great. I racked the wine twice, although looking back, I should have racked the wine a few additional times.
Brandon