I love Jon. I went there and enjoyed his awesome services (and his assistant Cheryl's) for the three years that I lived in Pittsburgh and could afford that kind of thing. I went probably 10 or 15 times to them.
I give Jon 5 stars for highlights (always perfect. Once he suggested something that i didn't feel like doing and he was totally cool about it, and then I regretted it in 3 weeks. He was right!) Also note that hair blow outs don't come with color treatments, so times that I was poor and didn't feel like paying 10 more bucks or whatever, awesome Jon would give me a blow dryer and let me sit and dry my hair myself if I wanted to. No attitude about it.
I give Jon 4 stars for haircut. My hair is very dry and thin, but I'd always ask for something 'hip' and requiring lots of thick hair, which is both not doable and not Jon's thing. He likes to do more 'classy' conservative haircuts. This is important to know if you want 'hip'... The nice thing is that he'll be up front with you. I'd show him a picture and he'd be like, "I can't do that with your hair, let's flip through this mag and find something you like that will work."
Never really interacted with anyone else there besides J and C, they were my people and so fun to be around for a few hours. Can't speak to any other stylists or treatments at Salon Destefino.
I really miss this place now that I'm in Austin.