My brother was a flight instructor at Air Desert Pacific a few years back. He gained quite a few hours (probably close to 500 multi-engine hours in one year). The instructors tend to be very good - many were trained at Embry-Riddle in Arizona.
He definitely enjoyed instructing many European (especially English and Irish) and Middle-Eastern students. The weather is great, the flying conditions in SoCal (Southern California) are excellent for training (because of high-density traffic and occassional foggy flying) and the women are gorgeous. What else could you want (if you are a male)?
Cheers