Things I liked: Certainly well made. Since my plan is to slice one or more of these down for some nefarious project or another, (perhaps potato or watermelon launching) it will be nice to know whatever failures are to be had, they'll not be found here.
Things I would have changed: Perhaps one or two additional mounting holes... Perhaps at least a piece or two even shorter for some of the aforementioned nefarious home workshop projects. (Actually, the real plan is to mount a red-dot sight on a fairly ancient single-shot, low-velocity, .177 air pistol,...so please don't be reporting me to Homeland Security, okay?)
What others should know: I'll check back in when I know more (and when I'm released from custody.) Really, they're very good quality.