I went to the Scottsdale location for a high altitude endorsement. They are basically the only gig in town for it (except for Falcon Field which incorrectly requires (depending on who you speak to at the moment) a ME rating to do it in the King Air-you don't have to be PIC for the endorsement). That being said I had a great experience. I will say, at least my experience, it was very geared to owner/operator which I am. I did have to do it in the old CE500 sim because the Mustang wasn't fully operational just yet, but my instructor Peter was great. He taught me a lot of real world scenarios plus just a bunch of knowledge he gained from flying through the years (even just flight planning advice on routes to CA to minimize turbulence and avoid ATC delays). As an owner/operator I obviously don't fly as much as professionals and I found the instruction, and general aviation advice to be very helpful. I am a physician so a lot of the knowledge stuff was second nature and they didn't waste time with me covering that. Even though the CE500 sim is old I still had a great time and found it to be pretty useful. We even shot the Canarsie approach into KJFK during the high altitude training because I noticed the lead lights while descending during the training,and we had extra time to kill. I can't speak for professional pilots but I can say if you aren't and need training they are great!