I like SNS Agmatine for a host of reasons [and not just because I'm a rep
].
First and foremost, compared to a dedicated preworkout product [such as NO Xplode], it's incredibly flexible with regards to when you take it. Playing around with doses of agmatine sulfate has been one of my more fun supplemental experiences - first thing in the morning, preworkout, post-workout, before bed - and clearly you can't do the same thing comfortably with most stimulant-containing pres.
Additionally, since we've started producing 50g and 100g powder, almost no powdered preworkout product is as cheap on a per-serving basis as our bulk agmatine.
The list of its positive attributes could really be quite lengthy, but I'll stick with one more and make my specific recommendations - agmatine sulfate has a myriad of benefits. I've noticed not only excellent pumps and vascularity [when taking 1g preworkout], but awesome all-day pumps when taken first thing in the morning, a huge difference in muscle fullness when taken prior to a high-carb meal, and improved sleep when taking pre-bed. Its list of purported benefits are long, and you should undoubtedly be able to notice more than one.
I personally like to stack SNS Focus XT [containing 200mg of caffeine] with 1g of Agmatine + 9g Citrulline Malate for a killer preworkout combination that provides a smooth, clean energy with long-lasting and incredible pumps. Other products such as iForce's Hemavol [which is non-stim and contains 1g of agmatine] make a great stack with Focus XT, as well, but aren't nearly as cost effective.