I'm a graduate degree'd engineer with a great appreciation for good product design and the owner of a handyman business who's installed quite a few similar shower door sweeps. With that as background ...There's nothing ground breaking about this particular shower door sweep, but it is well designed, uses appropriate materials, is easy to install, works well and is decently priced. The "sweep flap" on the bottom of the of this item is soft enough to conform to small irregularities, such as a slightly misaligned glass door. Disappointingly this item includes to installation instructions, but it couldn't be more simple. Merely slide the existing sweep down off the glass. This may require pushing with something with a hard edge (hopefully something plastic so as to scratch the glass), but sometimes I get them off easily with just my fingers. Then clean the glass and slip on the new sweep. Easy peasy .... Note that the glass used in frameless shower doors varies. This item is for the thinner 1/4" glass and will not fit on the thicker 3/8" glass doors.