That's what insurance is for
I've loaned out everything from CCD cameras, to C8, G11, Hyperstar, Adaptive Optics unit, various filters, even a C14, and it as often come back in better condition than I sent it in!
With some gear, the only way to know is to try it out, and not everyone has access to a club or local owners.
I'd rather someone use my gear than it sit in the cupboard.