Yellow Checker Cab has provided courteous service for my pre-scheduled trips to Willard airport and LEX pick-up locations during winter travels. The drivers have always arrived right on time and when there was snow on the ground, one driver made sure to park so that my door would open to the area of the sidewalk that was cleared. The phone people are always professional when I call to schedule pick-ups. I once had to call them at 2 am to change from an airport drop-off to a LEX pick-up location when a flight was cancelled that morning. Not only did someone actually answer the phone, the person was pleasant and alert and they were able to recall my address from my phone number (unlike another taxi service that couldn't even remember that I'd scheduled a pick-up at all, even though it was booked through their website).
4 stars just because my use has been only of this very specific pre-scheduled nature so I can't comment on the normal of-the-moment taxi services