2006 Helios P8; now replaced by the Mu-P8. All standard,
cheaper and better than the B , except the saddle which I upgraded.
I can't say the 20+% (up) were always fun, but I can honestly say that I only struggled on one climb and that was the last bit up Wrynose Pass for about 20 to 30 m. Otherwise I was fine. The frame felt very stiff, going up and down. The downhills from Wrynose pass provided several minutes of sheer fun (25%).
Edit: Gearing goes from 32'' to 93''. 32'' was too small.