Its OK, I always use the self service - sometimes the water leaves some horrid streak spots, sometimes it doesn't.
I'm not as huge of a fan of the price increase that went in about 6 months to a year ago - it used be 12 or 13 minutes for $5, and now its 10 - just shy of enough time to clean the car especially if is not rinsing well.
The places has really become run down over the past few years, and its pretty obvious that the absolute minimum is done to keep things working at the lowest cost, but, its nice for the convenience factor.