Since I have bought this lens in 2008, I have been just blown away by its autofocus speed. This remarkable lens is superb as an all around lens, a bit heavy but I compensated by getting a power grip to counteract its weight and its balance.
It's very sharp, plus its nano coating its a great bonus; For its price I recommend a lens filter to protect the front element
Please use a power grip to counter balance its weight and holdability