Does anyone have experience with either of these lenses? I'm interested in picking them up for my XTi and just wondered if anyone had any feedback. Thanks!

If your looking for a wide angle you might want to check out the following thread concerning wide angles - Wides 10-40mm

What lenses do you have at the moment?

I personally recommend the Sigma 10-20 - also in the other thread with samples.

If you're mad on one of the two suggested I would definetely recommend the 15-30mm over the 20-40mm because of the suggested advances in Image Quality based upon intensive reading of reviews.

Thanks for the help. I currently have a 24-70 2.8 and 50mm 1.8... so I'm looking for something in the 10-30ish range?