AC Delco Clear Vision 24 Inch Wiper BladesThese blades are similar to the Bosch, Rain-X, Michelin, and Pylon single-piece frameless blades that are sold in retail stores. They are approximately 3-4 times the cost of a traditional framed wiper blade. I've used the Michelin, Rain-X, Pylon, and Bosch Clear Advantage single-piece frameless blades in the past, and have found that the rubber blade generally lasts 1-3 years before they start to deteriorate. By deteriorate, I mean the rubber starts to set into a shape and no longer clears the glass as well as I'd like, which can result in streaking that can't be fixed by cleaning the blade using alcohol or other cleaners. The single-piece blades cost more and don't deliver any significant benefits to justify the added cost, but they look cool and all the foreign luxury cars come with them from the factory as of 4-6 years ago.The AC Delco Clear Vision blades come with a multitude of adapters, unlike the blades that are generally sold in most retail stores like Meijer, Target, or Wal-Mart (those are generally designed for the J-Hook style of arms which is common). However, many late model GM cars use a different attachment which requires an adapter that happens to be included in the AC Delco Clear Vision package.The AC Delco blades use adapters that are easy to clip into the body of the blade. I chose to use the J-hook adapters because my car uses those type of wiper arms. Installation was literally a snap. I immediately noticed that the blades were clearing my windshield without any streaks compared to my 3 year old Rain-X frameless blades.The spring that is used to provide the pressure for the blade to press against the windshield appears to be very strong, but this isn't much different from any other new wiper blade. These AC Delco blades have a "wear indicator" strip that is covered by tape to be removed after installation. I did an Internet search on these indicators, and it appears Valeo uses them on their VW branded blades, and is nothing more than a strip that changes color with exposure to UV radiation. This makes sense, since UV radiation contributes significantly to rubber deterioration. However, time will tell on when this indicator recommends replacing the blade. Even when I park my car outside year-round in Michigan, I can easily get 3 years out of a set of wiper blades: framed or frame less and regardless of brand. And even then, I could get by with using ratty old wiper blades. There's nothing that suggest the blades will fall apart and be unsafe to use within a year, especially when frameless blades cost so much these days.In conclusion, are these AC Delco Clear Vision blades worth every penny? I have yet to be convinced that frameless blades are superior to framed blades. Sure, there are less joints and moving pieces, but at a price point that is 3-4 times that of the least expensive Pylon/Trico framed blades? I can't say these or any other frameless blades are mandatory especially when they last just as long as the cheap framed blades before streaking. To be safe, replace your wiper blades each year but my experience shows they can last 2-3 years easily as long as nothing physically breaks.Overall: 4/5 stars, great frameless construction, comes with a multitude of adapters that clip into the body, strong spring to provide coverage on windshield. Still doesn't fully conform to my curved windshield at the edges, and these still don't convince me they will outlast an inexpensive framed blade.I will keep this review updated as I continue to use these wiper blades.UPDATE: 14 JAN 2013I've been able to use these blades in a variety of conditions, and this morning was the first time I had the opportunity to use this in freezing precipitation (ice and melting ice). The blades started to take a "set" in shape instead of trying to hug the glass, probably because of ice on the blade material. They began chattering and streaking and I noticed the driver side was skipping over a spot on the glass, but the interesting part is that the wiper arm connects to the blade right at this spot so there is definitely enough pressure. So all in all, these blades performed on-par or worse than the 3-year old Michelin Radius blades that these replaced.