The Radio Poppers I looked at aren't cheap at all either. However, I am no longer even considering Pocket Wizards at all. Their reputation (or lack thereof) on their model for Canon cameras inspires absolutely no confidence in me. Like I've said in earlier posts, I don't think PW has engineers with the technical expertise to design a reliable wireless system for CLS. If I decide I really need wireless out of sight remote triggers, I'll get the Radio Popper model, which from what I've read on this board already has a CLS compatable model.