I think they charge a bit much, but you do want to know it is done right, there are many other injector cleaning places that charge about half what they charge, but I could not guarantee the quality of their work.
I'm going to use this guy, http://www.mrinjector.us/ check him out. I spoke to him on the phone and it sounds like he knows what he's talking about. Ultrasonic cleaning, just like flagship, before and after flow charts just like flagship but he supplies you with the new seals/O-rings to the fuel rail and charges $16 each compared to $40 for flagship.
That's all he does is injectors and has a commercial test bench for them so how bad could he be? Also ships them back out the next day. Only thing he doesn't do is HPDI. If anyone has any experiences with him good or bad I'd like to hear them before I send mine in.
let me know how it works out. I can not justify the $40 per injector charge either and would prefer to get it done cheaper as long as it is done right.