Digital BW, The Print

I compared tripod v. hand held ("HH") with IS on v. HH with IS off.  The results are posted at  

http://www.paulroark.com/BW-Info/IS-test-200mm.jpg

The Canon 70 - 200 IS L was used on on the 5d2.  All shots are at 200 mm, were shot RAW, are un-sharpened, and are displayed at 100%.

I'd say IS works well with a speed that is at least one over the lens length.  

Paul
www.PaulRoark.com