I have three vintage Undercover models in .38 Special. I bought the first new in 1987, the day I was sworn in onto the job, and carried it as a BUG and ODG for the first few years. I inherited the second, made in 1966, when my dad died in 2010. He carried it in much the same capacity. I bought the third, from about 1985 (and a stainless one at that; I hadn't known they had made them in stainless back then) early last year.
They're all very impressive in fit, lockup, and finish. I'm carrying my dad's now, all this week, as his birthday would have been yesterday. Just kind of a tribute, I guess (his service sidearm, a Ruger Service Six, is on my nightstand this week as well.)
I handled an older Undercoverette at a store about a year or so back. I probably should have bought it. If I saw it again, I probably would.
I have no experience with the current crop from Charter Arms, but I understand the company to have made leaps and bounds in progress in repairing the reputation other owners of the company gave it in the years between 1990 and about 2005, when it ran under the names Charco and Charter 2000. It's original owners are back at the helm.