Del-Ton kits have been around a long time, heck, they've been around before most of these other folks got into the AR-15 game. I wanna say that it was somewhere around 2002 that I bought my first del-ton kit. They're not great, just mil-spec rifles, but if you want a cheap rifle that will run (what AR-15 won't?), then they're not a bad choice - but I wouldn't buy one.
The problem, however, is that you can buy a DPMS or Bushmaster carbine for the same price during sales, or $100 more at regular price, either of which will be a better finished rifle that will better hold resale value.
All in all, I wouldn't buy another Del-ton rifle or kit. There are better rifles at better values and at the same price out there.