I think it's a YMMV thang. TP seems to produce reasonable numbers for me, and doesn't get fazed by my feeble sprinting efforts at the velodrome. Mind you, I don't do standing starts (the other 20+ people using the track at the same time would get grumpy if I tried, I think) which might be the difference.
My best peak power numbers always come from standing starts, by some margin. I can produce ~400w more from one than I can in say, something like a flying 200m. It's bound to skew things a bit.
I think it's a YMMV thang. TP seems to produce reasonable numbers for me, and doesn't get fazed by my feeble sprinting efforts at the velodrome. Mind you, I don't do standing starts (the other 20+ people using the track at the same time would get grumpy if I tried, I think) which might be the difference.