I booked transportation very late. We had considered just driving ourselves to save money, but we were both very glad we booked the limo. I called a few places and went with the one that was cheapest and closest to my venues.
They forgot to call us to confirm the schedule, so I called. The driver was fine and followed a GPS unit, but took the longest route to get to the reception. We ordered a regular car, a Cadillac, since it was just the two of us being driven. Instead, we got a Ford Explorer looking vehicle. Really didn't matter to me, but it was nice to have the room for the pick-up skirt of the dress.
But, they were on-time, had the correct addresses and we were able to book for only 2-3 hours (most places you have to book at least 4 or 5). So, it wasn't anything fancy, but that's what we paid for.
I would recommend them if you need someone in that area, but definitely call around for pricing and timing information first.