For our airport transfers, we switched once, from a larger company to a smaller one. Nothing wrong with the larger one, in fact, they were excellent. We switched because we were hoping to get more familiarity with the drivers as opposed to a different one every time. So far in 2 trips, we've had 2 different drivers LOL so much for that! I prefer a driver that talks, I enjoy the interaction, so we may switch again; the company we use now, the drivers are pretty quiet...