I havehad second thoughts about APS sensor only lenses. I have two, EFS 60mm and the Tokina 12-24. That's $1k. When Canon goes to a full frame sensor these lenses will lose their usefullness to me. Canon has been good about improving their APS sensor cameras but at some point an increase in sensor size will be necessary and alot of lenses will be left behind. These things are too expensive to buy as camera technology changes. Its not likein the past, technology moves too quickly now and today's camera life span is a lot shorter. No more APS lenses for me.