Product review (5 stars): Works fine - don't forget the silicone grease on the o-ring
Works fine for much less money.  Regarding leaking reported by others, any time you install an o-ring or gasket that turns as it tightens, it needs to be lubricated.  When lubricating in a domestic water application, you should only use silicone grease - a very light application all around the o-ring.  Any petroleum lubricant can deteriorate the rubber; Crisco (as recommended in another comment) could promote microbial growth.