I had an encounter this summer that was exactly like my ATP ride. It was in denver on a heavily loaded 200 (of course) and as far as I can tell we encountered a microburst. I was PM and as we accelerated the airspeed paused right around 100kts then promptly flew past v1,vr and v2. We were airborne almost instantly and got the the red WINDSHEAR warning/aural shortly after. The CA firewalled the thrust levers and shortly after we got a significant loss of airspeed. It was everything he could do to keep it from coming back in contact with the ground. We didn't quite get the shaker but I know we weren't far from it. Needless to say I didn't need coffee for the rest of the day!