I've built a couple of Warmoths. Sold them both!
The problem with kit guitars, at least for me, is two fold: there's no possible way to try the guitar before you buy the guitar...AND: low resale value.
That said, I have played some Warmoth Strats that were wonderful guitars.
I wasn't so lucky with mine though...they looked great but even though they were light in weight and theoretically should have been keepers, they were just average in terms of resonance and lacked that elusive lively quality that makes for a truly great guitar.