Wife and I took a shared van both ways (which turned out to not be shared either way) to/from LAS. The service was great- right on time and the price better than a cab or Uber.
Both drivers were friendly and helpful, especially Kathleen on the return trip as she updated us on what happened around town while we were gone. She also knew the streets to use to avoid the freeway traffic caused by construction and the July 4th influx of visitors to the Las Vegas area.
Will definitely use them again for any trips over 7 days. Seven days or less I just park the car at the airport economy lot as that's about the price break point and the pick up spot for SuperShuttle is close to the parking lot anyway.