I have a different experience with Tiffany Town Car and Mears... I'll just explain what happened and I don't mean to make anyone mad! It was early October of 2000 and 4 of us (all adults) went to WDW for my DB birthday. Within the last 5 to 6 years I've used Mears two different times and I've never really had any complaints... I travel for my job and usually take shuttles from the airport to the hotel, maybe I'm used to it. When I booked the October 2002 trip I read the boards and decided to try Tiffany Town Car for this trip and had no problem reserving ahead of time. However, when we landed in Orlando and got our luggage (30 to 45 minutes after landing, flight not late) - no Tiffany Town Car driver. I had to call (SO glad I had my pda with all phone numbers and reservations!!!) Tiff Town Car twice and finally our driver showed up. No hello, no Sorry I'm late... he picked up my mother's carry-on (leaving us with the suitcases) and took off toward what we could only guess was the car. Not a good way to start the trip. We loaded the car - I don't know if they are supposed to help out or not, but he opened the trunk and got into the front seat (after throwing a child car seat from the back seat into the trunk). So, we got to The Swan (after a VERY tense ride - I can laugh now, but I truly have no idea if this was something we had done or if he was having a bad day) and I tried to settle up with the driver. At the time I made the reservation for the car, there was a coupon on this site for Tiffany for $10 off (I think) and I mentioned it at the time I made the reservation. So, not only would the driver not honor the coupon (which honestly wasn't a big deal - I am a really good tipper and booked the car for service and convienience, not to save money), but he ARGUED with me so loudly and rudely that I forced him to call his dispatcher so that I could ask her what the total was (I thought I was so smart and had planned so well... I think that at the time it was 70 or 80 round trip and then you tip on that, but he was trying to charge me $10 more that the fee for the car and then a tip on top of that) and how could I be sure that someone would pick us up for the return to the airport at the end of the trip? She was nicer, but I was (ashamed to admit this) afraid not to tip this guy because I could just see someone 'forgetting' to pick us up! So, in conlusion, I decided to book Mears again for my trip coming up in Nov 2002 (POFQ) to save myself from the chance that I might have a similar experience. I don't read these boards EVERY day, but have honestly never seen anyone else post a bad experience with Tiffany Town Car, so maybe it was me!
Sorry for the long post and the rant - I was so dissappointed and mad about the experience, that I never called Tiffany Town Car to complain (what was the point), nor did I post it on the boards. I will, however, look into some of the alternate suggestions listed in posts above! (PS. they DID come to pick us up, but honestly, no change in attitude. It was a different guy, but I guess we were already 'labeled'!!!!)

Good luck with whatever decision you make and I hope that you have a great ride.