This can help people who can't shift due to arthritis, which is really cool. I read somewhere recently about an older man, I think in his 90s, who put this on his bike for that reason.
I didn't mention in my OP that I initially thought the bike would shift by itself, like an automatic transmission.
I rode it around the block, then went back to the shop to tell them I thought it didn't do anything. Doh! I can't believe they let me live that one down.
'02 Eddy Merckx Fuga, Selle An Atomica
'85 Eddy Merckx Professional, Selle An Atomica
'10 Soma Double Cross DC, Selle An Atomica
Slacker on wheels.