I use Bewleys all the time - easy parking, very regular shuttles, sheltered wait, and often cheaper than Quickpark. Quickpark is actually fine, but if you're pulling suitcases from the car to one of the bus stops, it's not a good experience - the surface is totally rough and pitted, and if you're unlucky enough to have just missed a shuttle, there may be quite a wait in a very draughty bus shelter, apart from the fact that you've dislocated a shoulder trying to haul luggage to the bus stop.