Anyone used ever used it? I found one on sale today at Petco and couldn't pass it up. I trim Gunner's nails weekly, but they are still so SHARP! I've heard mixed reviews on the pedipaws and was wondering if any of you had any feedback before I opened it up to use it. Any pointers? Gunner is great about having his nails trimmed so I think he'll be fine with it, but I'll start slow anyways.