Honestly, for most girls I know, once you've had glass... ahh...
couple of points - they're mega tough and made out of strong stuff. But saying that, I wouldn't go dropping them on tiled floors ;) I'd also recommend storing them nicely - most of the LF ones come with a nifty black velvet bag, which does double duty in looking divine as well as protecting your beauties.
Secondly, if you want to warm or cool your toy, it's recommended you use warm or cold water to do so - freezing them can be bad for them (and you, remember getting your tongue stuck to an ice lolly?) and please, please don't ever think of microwaving them! Sizzled bits are not fun.
In other news, I find orgasm enhancers work well with glass toys (TC orgasm arousal gel, flower balm etc) as the glass doesn't warm the gel up, which can dull the effect when used with fingers, I find!
Have fun x