The LandRider autoshifting rear derailleur split cam thingy. Wow, an idea that just won't die thanks to heavy infomercial marketing.

I rode one that I was selling for my brother one day. Just awful erratically off-beat shift points. Spinning at 90 rpms? No, you're not, we just upshifted... The slowing and shifting to a lower gear wasn't terrifically, bad, though. The front derailleur worked normally.

Ugggh.