I've used biogen gear over the last year. Their blend 500 is one of my favorites. Not underdosed at all. I've also used there Deca, EQ, Prop (LOVE IT), and Nolva....all which seemed to do the job just great.
I've used a bunch of QV, Bristish Dragon, IP, GP (just to name a few) over the years. I would compare there products to Genza's gear. It's not quite as powerful as BD or (legit) QV, but it is well worth the money. Hope this helps!!