thanks, Russ... i quite like the 24-105. it's got a very versatile focal range, especially for landscape work, and in terms of sharpness, it's probably the best lens in its range if you're shooting on a full-frame Canon. the corners can be a little bit soft wide open, but that's common with wide lenses on FF bodies - if you're using a crop body, you won't have that problem, but you'll give up some of the wide-angle perspective in exchange for a bit more telephoto. the AF is fairly fast, and though i rarely use the stabilizer, works well and it's handy for those times i do shoot freehand with it. my only complaints - such as they are - are that f/4 isn't as fast as i'd like for some things, and i wish it had the same range as my Tamron 24-135. that extra 30mm doesn't seem like much, but it's really handy on a "walkabout" lens.