I'm one of those who raves about his J.C. roundface lock.
Never built a Chamber's kit though. I know people who have an they speak of the kits like I do my lock.
The main reason I didn't go the rout of a J.C. kit was $$$. What I paid for an in-the-white gun from Tennessee Valley Mftg, is about what a J.C. kit costs.
There's some folks who would say why not just get the J.C. kit and spend a few hundred bucks to have someone finish it up? Well, the reason is I started out with a $400 budget in mind and already spent more than double that by the time I called it quits on the "why not just spend a little more..."