Actually, 4 watts is pretty decent. That'll be about 40 seconds over a 40k. They're the only upgrade I can think of that actually performs better at lower speeds, meaning while you only get the benefit of a disc or aero helmet if you're holding close to 25 mph through the flats, you can get the benefit of ceramic bearings at any speed.

As far as finding a decent price....probably not. There's no real cheap solution as there is for many other components, and even if there was, I wouldn't use them since the tolerances that make ceramic bearings what they are require expensive manufacturing processes that inherently drive the price up, so anything that's cheap is probably, well, cheap....and a waste of money since it won't do anything for you. And installation isn't cheap, either. They need to use a special bearing press, and you'll want to take it to someone who has done this before, since they can easily be maladjusted. Plus it's a lot of bearings...generally four in the front, six in the back, and a few more in the BB (I think....either way, it's a lot).

All that said, it's a great upgrade if you've already done everything else to your bike that you want to do and you are up to spending the money.

I had no idea that you could get Enduros that cheap. That's pretty much the bearing set you want. I'm pretty sure that they fit just about everything except Zipps.

I'm pretty sure Enduros fit everything except Zipps, but ask either HED customer service or your LBS to make sure.