Midas Muffler sold me a muffler with a lifetime guarantee. When the muffler failed after several years and had to be replaced, (free) they told me I also had exhaust manifold bolts that were loose and would have to be tightened at additional expense. They said they couldn't install the new, free muffler without also tightening the bolts. When I didn't go for their scam they said they'd make the "repair" at no extra cost. I've never gone back.
I learned to scuba dive through Napa Dive and Sport. This is a quality enterprise. The staff is professional, friendly and patient. The classes were thorough but still fun. I came in not knowing anything about diving except that I wanted to do it. I left well trained and enthusiastic about diving. Thanks to the great dive trips the shop offers, I am now even more enthusiastic. This is a great place to learn to dive, take advanced classes (highly recommended) or sign up for a warm water trip.