Do-it-yourself A/C recharge

anyone had any experience with the kits that are out now. It looks easy enough, but I wondered if anyone out there has tried them on their blazer?

Tried it on the wife's Cirrus. not that bad, but by one of the better sets with the gauges, and buy more coolant than you think you will need. I bought the 11 oz kit, and it is still a little warm, should have bought the 19 oz one. Now I gotta go buy another can and waste some of it. Bye bye ozone layer