Yes, I would recommend Fahrenheit Yoga, but only to seasoned yogis who have a regular practice and can endure extreme heat.
Let me be clear - I have been practicing for about four years, regularly, have gone to many a heated class, and I have never had issues besides sweating a bunch. I always attend classes hydrated, well-rested, and energized.
At Rebecca's Hot 26 class here, I felt nauseous light-headed, and left the class feeling more stressed (this has never happened to me before). However, I did like Rebecca's teaching a lot. She was helpful, kind, and encouraging. Afterward she sent a postcard welcoming me to the studio!
I also attended Nora's Hot 26 class. Before and after class she seemed to be a chipper, sweet, and welcoming yogini. I disagree with her philosophy in the classroom, though - that of depriving oneself of water or child's pose breaks for the first half hour. I understand that we should "come to class hydrated" but like I said before, this heat is unreal, and I don't think in a yoga class students should be reprimanded for taking care of their bodies. She also said something along the lines of "not compromising the pose for the breath," which I find incredibly un-yogic.
I had gone to three or four other teacher's classes, and enjoyed them each (including the two I described). I simply think practitioners should think twice about for what they're prepared, though.
Most of the classes are labeled in the description as "appropriate for all levels," but I disagree with this statement. Challenging, hot, and fun classes!