Update again Figured it'd be good to update so people who haven't tried cos loan get an idea of what it's like. The newest person I'm emailing is very helpful. I do have to wait till 16th to request a loan but I can get a rf 400 or 600 right away once that date is reached. They went ahead and got the other stuff needed, confirming "pros status" etc, so that should all be done by 16th. So hopefully by end of October I'll have tried both 400 and 600 and given mini reviews on them