Summary: This 18-135mm lens is nice enough, but seems overpriced for what it is. It works perfectly on every Nikon DSLR: D1, D1X, D1H, D2X, D2Xs, D2H/s, D50, D70, D70s, D80, D100 and D200. It's sharp and agile, but I suggest saving your money for the spectacular Nikon 18-200mm VR (Vibration Reduction) which you know you really want. VR is important at longer focal lengths like 135mm. See Why VR Matters for examples.
Summary: I bought this to replace a couple of kit lenses. I'm quite pleased with the quality of images I can get from this lens, especially given the low price. A nice little lens to add to your quiver.
Summary: I bought this lens in a hurry as my wife accidentally broke my 18-105mm with VR. My caution to anyone looking at this lens is to be sure you have a steady hand as you will see a difference in the clarity of your pictures. The reason I gave it 4 stars is because there is noticable dust inside the lens on both ends. Unfortunately, you can see speckles in some of the images depending on the background and exposure.
Summary: I have had to repair this lens 3 times and it still does not autofocus correctly. I have used it on a Nikon D80 and D5100. Each repair requires 2 to 3 weeks because parts seem to always be on back order from Nikon. My older Nikon lenses lasted years without any problems.
Summary: I picked up a used 18-135 in July 2013 for a good price for the D300. I was using the 18-70 and it's a sweet lens, but I wanted the extra telephoto focal length of the 18-135. Yes it's known for pincushion distortion from 28-70mm range. It's worse than the 18-70 but usually not a problem if you're not shooting architecture. It has vignetting at the extreme ends worse than most zooms, but it's not THAT bad.