Product review (5 stars): works well
Exactly what I need to get the dryer fixed. The idler pulley (a real wheel) is a even better design than the original one (no wheel, just smooth half-circular mental that belt glide through).

EDIT: 12/12/2014 - After putting 1 year and 9 month of the new idler pulley into service, the idler pulley's axle is seizing up and make high pitch noise when running the dryer. Has to remove it and use the original old one to get rid of the noise. I guess the old design is meant for some good reasons after all. No turning parts no squeaking noise. I'd recommend not to use the new wheel-turning pulley if the existing one has nothing wrong. Hope my feedback is helpful for anyone out there.