I've used Tropinol, PhytoSerms and Testalensis. I can say that they worked better than other test boosters when it came to strength and aggression improvements. However, I noticed a drop in libido on all 3. I dosed as recommended: 3 caps for Tropinol, 2 caps for PhytoSerms and 3 caps Testalensis.
To me, I'm fine with a drop in libido (my wife actually prefers it), and gains in strength. They each seemed to have their own characteristics with Tropinol being good for aggression/mood, PhytoSerm good for strength/mass, and Testalensis was good for energy. Libido dropped with all three over the course of it, though I didn't finish with the Testalensis yet.
Overall, I like Bulbine products, they work pretty well for me, better than traditional boosters. I think I get better results with less, so don't go overboard on the number of caps!