Actually, that's what I was first thinking when I first heard about it... Being a former runner and cyclist, even just ten extra pounds seems heavy to me... but then you think about it... the only time you'll notice the extra weight is when you're trying to hit your top speed, and you're not exactly going to try to set a new world speed record if you're just going to the office.

Ang ganda pa ng system, it automatically shuts off when you stop, or when you're going faster than the engine can go, so it doesn't guzzle at idle or when you're pedalling hard.