I recently purchased the tamron 16-300mm lens for my Canon 60D dslr from Wex Photographic which is a UK based online retailer specializing in cameras and camera equipment.
I am happy with the lens since it is weather resistant and shoots at great quality but it is not the sharpest lens out there. This should however not make a difference since it is still sharp enough and you will not notice any lack of sharpness unless you would be obsessed with pixels.