I've used Ttokkyo's testanon 250 as well as Denkall's T400, and I personally think the testanon hurts a bit more. For the T400, my ass was painful and red for 5-6 days after a shot. And a bit of advice: don't do T400 quad shots unless you mix it with another less-painful AS! Unless of course you don't mind not being able to walk for 3 days! In my experience, 1 cc hurt only slightly less than 2 cc, but the pain lasted a few days longer with 2 cc.
Jotun79