interesting, i was reading about ibike today. its still 600 dollars though isnt it? from what i read, i bike uses a bunch of different factors, such as air pressure, speed and riding position and road conditions to calculate power. it can be pretty close to other power meters, but i don't know how accurate it is if you change your riding position a little, riding a rougher roads, lower tire pressure....where as a regular power meter isnt dependent on those factors.