HvPnyrs's last post was making me snort with laughter at work...

This is all helpful. I probably should have clarified that road vibration has been my main issue with frame mounts--I've lost multiple lights by having them work loose and fly off my bike and the plastic frame mounts that come with many u-locks just seem weak. I was carrying my old u-lock in my backpack, but as the weather gets nice I'm going on more pleasure rides and want to leave the pack at home sometimes!

Stryver, I do work not far from an artisanal hipster bike store (Reload) and their offerings are indeed pretty... But it'd probably be more practical to copy you and keep some monster U-lock at home (for outdoor overnight parking in my backyard) and have some medium security option that I can carry for errands. Work is pretty safe, plus I can leave my bike in the coatroom if I need to (unless it's raining and the coatroom is full of, you know, coats).