I started doing Lagree classes in SF about two months ago (3 times a week). Prior to that I had no experience with a reformer. I sadly no longer live in Phoenix but wish I did solely for this studio. While I was visiting I was able to make 3 of Tiffany's classes. Not only is she incredibly helpful with making sure you are doing the moves correctly, she has a great encouraging/motivating style. Plus as a bonus she mixed up all three classes so moves never felt stale or boring. The 40 min class actually breezes by and I look forward to working out (I can't say the same about a lot of other workouts I've done). You'll see results pretty quickly and discover muscles you didn't know you had!
If you've been considering getting into a work out routine (especially one less than an hour) I highly highly recommend Lagree and specifically this studio. When the weather is nice having the garage door open is great and all the artwork/murals on the walls are a nice touch to making the studio have an inviting element.