I also had my banding surgery in Tijuana, Mexico with Dr Lopez Corvala. My surgery was done 2/8/08 and at the Hospitales Angeles in Tijuana. Dr Corvala and his assistants were super helpful. They truely want you to suceed.
The ONLY complaint I have is really partly my fault. I felt like a complete outsider at the hospital because about 99% of the nurses and staff speak only spanish. I speak about 10 words of spanish. I felt it a little uncomfortable when a nurse would come into my room and inject my iv with a Fluid but could not communicate to me what it was for. Like I said, I knew I was going to Mexico, I should've brushed up on the espanol.
Luckily I have a doc about 45 mins away that has gladly accepted me for my aftercare. My insurance is nill and he understands peoples reasons for going to Mexico due to costs.
Good luck with your journey and research. I know word of mouth is the best advertising, I would go to Dr Corvala again in a heartbeat.
Good luck!