I just used the service in January and it wasn't the most magical experience in the world. I'm used to DME at WDW, which is outstanding.
After arriving at LAX on December 29, we were told to go to the bus stop and the bus would arrive on the half hour. It pulled up within 5 minutes on schedule, and my sister and I moved toward the curb and waved at the driver. He did not even stop and drove right on by - even though we were waving at him the whole time and walked right up to him to grab the bus!
We were told before leaving the airport that it would come and the driver would come out and see if anyone was going to DL. That would have been nice, but stopping would have been better! We called and they actually sent the bus back, which was very nice of them. We waited about another 15 minutes for him to come back (and it was definitely the same driver).
The driver on the way back to LAX was very personable and it was a very nice experience.
So, I guess I'm in the middle. Good luck. I still think it's better than Super Shuttle.