I've hired from Sixt at Glasgow airport a few times now and the service has always been outstanding. This occasion was no exception - the booking process was fast, simple and transparent. The staff were more than happy to help when I had a question. Collecting the car was a streamlined process as usual with four members of staff at hand; the same could be said about the return process. I was delighted with the car itself and could write a whole separate review on that.
Overall, a very enjoyable experience with no stress whatsoever. Thanks to all the guys at Glasgow airport Sixt (and a special mention for John and Alistair).