I had been looking for an upgrade to the cheap and cheerful kit lens that came with my canon 30D so did some extensive research on the forums to which lens would suit my needs for under £300.00.
Many of the forums were praising the Tamron SP AF 28-75mm f/2.8 XR Di and I must admit I am now one of the happy customers to add the list.
I've had this item for a couple of weeks now and have taken some 200 shots. I must say it has made a massive difference to the quality of my photos and the pleasure in taking and showing them from my Canon 30D. I have the 18-55 kit lens and also purchased the highly recommended budget priced Canon EF II 50mm f1.8 prime and to be honest, these two lenses have not been on my camera since the purchase.
My main shot subject is of my children and family so having the f2.8 across the range on this lens really helps in lower light conditions.
I've found the sharpness to be pinpoint, colours are rich and accurate, yes it sometimes hunts for focus a little in lower lighting, but not so much so that you'd really notice at all especially if this is your first more serious purchase of a lens.
My other options were the Canon 17-85 f/4.0-5.6 IS USM. Canons 17-85 has the wider range at both ends and Image Stabiliser but on the whole my theory is that for moving subjects like the kids IS won't make a whole lot of difference... it is the higher shutter speed that the constant f2.8 of this Tamron allows that makes the difference.
If you are considering a budget lens that wont blow the bank, I cannot praise this lens enough.