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Question: Should the VC growl?  Mine does and it shakes the image in the viewfinder.
Document: I may be biased b/c this is my first DSLR camera, but I can't live without this lens. It is fantastic for up close and far away shots. The VC is a must have and took a bunch of shots deep sea fishing with the boat rocking and the pics were perfect...if not outstanding. My buddy who has several canon cameras and lens really liked it and also bought it after testing mine on his D40 Canon.
I have this lens on my Nikon D80. Was going to get the Nikon 18-200 but the image quality on that lens is disappointing. The Tamron 28-300VC has proved to be extremely versatile. I took it to the zoo and it was perfect! The VC is very loud and clunky sounding. It'll take some getting used to but it's not so bad.
I was pleasantly surprised at the image quality that this lens produces. This is the lens I leave on my 1Ds Mk III most of the time. I have L lenses I use for my professional work. For the money, you can't beat this lens. Tamron has elevated their game to a higher level which is evident with their 24-70mm VC. A lot of pro's are using it now.
Absoloutely sharp, crisp, more so at 200-250 range with VC on.Compared to Nikor 18-200, f/3.5-f5.6 , the lens is lighter shorter, but there brighter image with Nikor lens, although the shutter speed and sharpness remains the same.Macro , option is a definitive plus, i could have never imagined doing 300mm , at one and a half feet from the flower.
It debunked for me the myth that only "L" class lenses produced great pictures (that is a self-effacing statement in-itself as I would like to believe that my vision and creativity have something to do with the process.... but back to the Tamron) and I came to accept this as fact until a friend of mine lent me this lens to use as a walkabout lens. I was impressed enough after one week to buy this lens.
My new Tamron28-3 00 image stabilized lens was shipped properly and works perfectly as advertised.
I am a photographer and purchased this lens too use on the Canon EOS 7D. I have had this lens for about 3 years. On the 7D, the further you zoom, the softer the image gets.
I recently borrowed this lens, and have been very disappointed with the image quality compared to Tamron's 18-270 lens, which I also borrowed for use on my Canon T2i. Pictures are much softer, and stopping down to f/8 doesn't help as it does with some other lenses.
Bought lens 6 weeks ago and am very impressed with its capability. The image stabilization really locks on and the lens clarity is excellent. I consider this lens to  be of pro quality. Have shot still and air show subjects and the lens operated excellently.
I had such high hopes for this lens. However, I've learned that if specifications on paper seem too good to be true, it often is. The image quality, is a disappointment. Perhaps the copy I received was not sharp, but you can't honestly expect a lens with this much range to be without trade offs. Overall the images were soft, and dull.
Answer: I don't think it should, mine never has.