Mitch is probably the best at his job. He is very tech savvy when it comes to bikes and always treats his customers like rock stars. I have referred some friends and they always come back happy. He's the kind of person who will sell you exactly what you need and not try to push you into buying something over your budget.
As for Bicycle Warehouse, it's just a great place to get a bike or get your bike tuned. I've bought two mountain bikes from them and I'm always satisfied.
I think one of the differences between BW and other bike shops is that their staff actually rides the bikes they sell. This really sets them apart from other shops were they hire salesmen.
I like this new location although I usually shop at their other location in PB or Kearney Mesa.
If you're looking for a new bike or a tuneup BW is the place to go.