*** STRONGLY RECOMMEND *AGAINST* USING CLS.
My experience was along the lines of Laurie R, and almost identical to
Peter D from San Jose.
At around noon, we schedued a pickup from our hotel for 6:15p. We were waiting at 5:55p. CLS NEVER SHOWED UP! Two Executive shuttles came and went, three Grayline, and a Showtime, but NO CLS. We called CLS at around 6:30p to find out what was going on. They *claimed* a shuttle *had* shown up (which we knew to be patently false since we were sitting out there closely watching the shuttles). CLS did not offer to immediately send a shuttle for us, and did not offer to comp our ride for having failed to show. Their recommendation: take a taxi at our own expense. Thank you CLS... FOR NOTHING! (literally)
This review may ulimately be moot. Rumor has it that the McCarran (Las Vegas) airport is only going to allow four shuttle/limo services next year, and CLS may not make the cut.