I've used HCGenerate (original), Phytoserms-347, and Unleashed.
Alone, HCGenerate and Phytoserms-347 were excellent. I had probably a 75% feeling of being "On" while using them. I've also used HCGenerate and Unleashed together, and that was the closest to feeling "On" I've felt, without actually using AAS. The libido boost from Unleashed is another nice benefit as well.
I'm currently at work, but I believe HCGenerate and Phytoserms-347 were each good for approximately a 200+ boost in testosterone levels from my base. I have blood work for each, so I know this for a fact. I have no blood work for the HCGenerate/Unleashed combo, but I know I felt even better than just HCGenerate solo.
I really want to try Test Stack 17 solo, but need to find a good span of time where I've been "Off", so I can have comparative before and after blood work done.