OP, if you are in fact asking about PCT Assist and not cycle assist, i am a fan. I recently ran 4 weeks of SD 20/30/30/30 with Nolva + DAA + PCT Assist, and my recovery was amazing. I've not run a cycle as harsh as SD, but i have run 2 other PH cycles with Nolva and once with Nolva + DAA. Comparing my recovery on those milder cycles to this harsher cycle and the addition of PCT Assist... i can tell you it does help. I don't know if i will always buy it since adding a bunch of other products to your cycle becomes pricey, but it did in fact speed up my recovery. My cycles in general are simple and cheap though. 2 bottles of whatever PH i'm running, 1 bottle SNS Liver Assist XT, 1 bottle SERM, 1 tub DAA. That's it.