Yes, but not personally...
Deb, my wife('s) - parents live in Yuma, AZ and travel to Los Algodones to get all there dental work done (as well as all their optometry, etc.) along with thousands of snow birds... Also, Deb's uncle got his implants done there and had a great exp (saved a swack of $$). Deb has only had her teeth cleaned last time down and everything went fine (not as intrusive as implants, I realize). Also, a neighbor got his done in the fall (Mazatlan, I think) and also had a good exp., (even though he screwed up the appt. so they had to accommodate him in another city - from what I remember him telling me)...
Lemme know if you want more info...
Peter