I ordered a Greenspeed SLR in 2002, so it's been awhile since I made the leap. My muscles took lots of time to fully adjust (read: years); if you think about it, that makes some sense because it took years for your wedgie legs to develop. More difficult was the transition in thinking - I have some small hills around the DFW area, and I'll get killed by an equivalent wedgie rider on any decent uphill. (On the other hand, nothing short of a racing tandem can keep up with me on a downhill.) Add to that a natural 2-3 mph speed drop and riding the trike can be a humbling experience. That mental issue then translates to pushing too high a gear, which drops your cadence . . .