Camera Labs

I'm thinking Tamron 18-270mm F3.5-6.3 VC.
Have no idea if it's a good lens or should I look somewhere else?

I am thinking 17-50 Tamron 2.8.

What do you currently have?

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Canon Powershot S95, Canon 7D, 15-85, Canon 85 1.8 USM, Sigma 30 1.4, 50mm 1.8, Canon 100 2.8L IS Macro, Canon 70-300L IS USM+Kenko 1.4 Pro 300DGX, Canon 430EX II and RS 4 Classic

Depends what you are looking for, I like superzooms, but you've got to bear in mind its not as sharp say a 17-55 f2.8 type lens.

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Nikon D5000 and D300 with 12-24mm, 35mm f1.8, 50mm f1.4, 60mm f2.8 Macro, 18-200mm, 17-55mm f2.8 (all Nikon)

As a previous owner of the 18-270, it is not a bad lens for what it is, but of course you will get better quality if you get multiple lenses covering the same range. Over the 18-50mm range it is about as sharp as the others in the middle, although it does degrade more in the corners. Trading off that, of course you get a massive zoom range. Personally once you get to 200mm+ on that lens it does lose sharpness.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.

Tamron makes quite decent glass, and some quite knowledgeable people say their vibration control is as good or better than the big boys' versions. Lens creep can be a bother, if the camera is oriented vertically, but that is true of all superzoom SLR lenses, including Nikkor and Canon. My wife and I have personal experience with pre-VC Tamron 18-200mm lenses on Nikon and Canon cameras. She likes the superzoom concept; I do not. She accepts lens creep and sharpness compromises at each end of the focal range in exchange for not ever having to swap lenses in the field.

True, there is a latch to prevent creep, but it only latches at the 18mm setting.

If you have a Canon, be SURE to buy the right version! Di is for full-frame Canons, Di II is for cropped-frame Canons. Di will fit cropped-frame Canons, but the electronics will not "talk" to each other.

Superzooms are not without merit! My wife can get a shot at a distant bird or something, while I miss some opportunities due to having the wrong lens mounted. On the other hand, I am more likely to have my camera in hand, with a fixed-focal-length 50mm making the whole package handier.

Just to be clear, my wife is much more experienced and talented than I am.

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Canon 7D/5D/40D/1D2N; Nikon F6, FM3A, & Coolpix A; Canon 40mm Pancake, 135L, 50L, 35L, pre-II 50mm 1.8, 100mm 2.8L Macro, 10-22mm EF-S, 28-135 EF, 400mm 5.6L; Nikkor 50mm 1.2 AI-S, 50mm 1.4G, 50mm 1.8D, 16mm 2.8D Fisheye, 180mm 2.8D, 100-300mm 5.6 AI-S; Tokina 17mm & 100mm 2.8 Macro