I've had the pleasure of using both DTH/and Activate Extreme/Lean Extreme and I can honestly say, the results came quicker and easier with the Get Diesel stuff. The stuff from Desiger Supplements took a tad over 2 weeks to kick in, but I was feeling all the good stuff from the other stack within the first 48 hrs, no joke. Also, DTH/ made all my pre-workout supps way more effective, as I was able to lower my dose of JP8 and still get equal results. As to the JP* vs. Jacked question, again, they are both great products, but I would go with JP8 here for the focus factor, as Jacked doesn't get me dialed in like JP8 does, matter of fact nothing does. I can get by with 1 scoop of jacked, or 1.5 scoops of the old JP8. What really is awesome is mixing 1 scoop Jacked with 1.5 scoops of the old JP8, it's plain nuts!! Those 2 together are bar none the best pre-workout combo I have ever tried to get me dialed in and stay dialed in. After about 5 hours later, I'm finally winding down, not a crash, but a gradual tapering down. I haven't tried the new JP8 yet, so I can't help you there. Good luck!!