I didn't expect much out of these, considering the price, but they're turning out to be great. It sucks being a glasses wearer, you know what I mean... We can't wear regular sunglasses like everyone else.
The polarized effect is cool, I'm not sure what it means, I just know it's supposed to cut down on glare. It also makes some objects appear blue, it's kind of trippy. There's clear packing tape on my windshield and it turns cool colors that I can look at while driving.
The clip mechanism is simple, it just bites downward onto your lenses with little rubber pads. It looks as though they're starting to come off, though. No big deal, just don't scratch your lenses taking them off. The plastic horizontal bar that another reviewer mentioned IS poorly placed; I also snapped these off using two pairs of plyers (the plastic is tough). The bar was meant to rest on top of your frame, but what it ends up doing is making them sit too high up. Easy fix.
The flip-up part of these works alright, but mine sit a little crooked when you flip them up. I can't notice it myself, but if you're worried about how you look, then just remember that. They also come with a clear plastic case with a lip to bite onto to keep them from bouncing around. The case is bulky but works well nonetheless.
The lenses are plenty dark enough, and easy to clean with some water and wiping. All in all, I would say money well spent if you're a glasses wearer and can't afford/find prescription glasses.