I've used Luxe a few times in SF and the one aspect that I really appreciate is that I can drop my car off at one place and have it brought back to me at a completely different location. So, if I know I'm headed to a happy hour/dinner after work in a different part of the city, I drop my car off with Luxe in the morning at my office, take a Lyft/Uber/walk from the office to wherever my next location is, and then request Luxe to drop off my car wherever I'm at. Removes the hassle of trying to find a parking spot near the apres-work spot and/of having to backtrack to the office just to get my car..
That's pretty much the only use case that I've used it for thus far, which really amounts to maybe 3 times over the past year (SF is not my typical office); however, I do find Luxe to be convenient in certain circumstances and thus far all of the 'valets' I've met have been great.