I have been using dazed stuff for 2 weeks (all good btw), but ran out of 4AD. I had been given a bottle of the VPX 4AD, and thought to myself how bad can it be? Well, 2 ml went into the delt nice and smooth, no pain or anything. Then about 2 hours later my delt was more sore than it has ever been. Even now (next day) it hurts like hell. The other delt has dazed's 4AD in it and there is only mild tenderness (and I do mean mild). The good news (I suppose) is that the swelling caused by the VPX is impressive, but thats about it. I will not be using it again as it even made sleep diffiult. I will be trying the Meso 4AD later this week and will let you know how is goes.
EDIT: I thought I would re-iterate a little later in the day how freaking sore my delts is. Hurts when I look at it - never again with the VPX.