Great business run by knowledgeable staff. I went with a friend to ride Bootleg Canyon trails. I rented a Specialized Stumpjumper FSR ($3000 bike) for $55 for a half day. The riding was incredible with great terrain and a variety of options. They run a shuttle for $5/ride to the top of the canyon which is well worth it. Not sure if we got lucky with the bike, but it seemed that all their rentals were high end.
If you're riding the canyon make sure to bring a pump and a few spare tubes as its easy to flat back there.
Don't bother buying a trail map for $5. It's not worth it and something they should include for free with a rental.