I've had a Q3 for many years now, the switch went bad several times so I started using a foot switch and haven't used the switch on the saw ever since. I have a smaller Delta for a back-up. Hoping to get an RBI in a couple of years then I think I will get rid of the 2 Deltas.
I've never bought blades from D&D but have bought wood several times. Always pleasant to deal with, I'm lucky that I live nearby so I have never had any experience with their mail-order service.