If you're looking to buy this lens, you already know what it's all about.
It's expensive - but worth every penny!
It's heavy - so get a monopod!
It's bright and fast focusing - excellent for sports & action!
It's one of Canon's best white lenses - so stop crying and hit the "buy" button already!
There are a few cons: It is heavy, but it's not impossible to handhold. But do yourself a favor and get a monopod. Also, the standard lens cap is very clumsy. Get a Zeck lens cap that works almost like a regular lens cap does on smaller lenses. The Think Tank Photo Hydrophobia is also an excellent rain cover for the 400 and camera body.
Accessories I Recommend:
* Gitzo Carbon Fiber Monopod - GM5541
* Zeck Lens Cap for Canon 400mm f/2.8L USM IS
* Think Tank Photo Hydrophobia (raincover)