Ok. So what's the verdict? Is it worth to buy this lens or not? I use Canon EF-S 17-85mm f/4-5.6 IS USM and Canon EF 70-300mm f/4-5.6 IS USM with my Canon EOS 40D. I am happy with both but this Tamron 18-270mm - for a very reasonable price - would kind of cover both ranges and eliminate lens swapping in some situations.