I'm just wrapping up an IDS Mass Tabs 4 week cycle and have also been happy with it. Put on 10 dry lbs. Lost a couple inches off my waist, appear more vascular and had decent and steady strength gains. Sides were low but it definetly shut me down quick, libido well below normal.
I know nothing about Bulk Tabs by IDS. I think alot of people mix up Mass Tabs with Bulk Tabs and vice versa.