Yeah, I've used those airtime valves, good quality. Only thing was about 3 months after attatching my first one I got a leak around the base. I've put some glue around the base of the self stick type just to help seal them ever since.
I've done this twice for replacing nipples. Boiled a mug full of water in the microwave, submurged the nipple, pealed it back bit by bit. Reheated the water and repeated til the nipple came off. Used kitefix glue to ahere the new nipple. No problems since
ATM I dont have to. The work Im doing right now I can do on my own hours as long as it gets done by the due date. So if its blowing from 10-4 I go kite, come home, take a shower, and go in to work at 5