I did some reading about it and it CAN damage glass tops, there are a few stores of people breaking the glass (which they had replaced). However I also found a lot of stores of people who had used cast iron on their glass cooktops for years without problems, even without scratching.
Just depends on how much faith you put in your cooktop 
Lodge promised me it wouldn't damage mine (or at least Lodge cast-iron works with any cooktop)
Yeah, that's what I'm worried about. Something shattering. Scratching should be easy enough to avoid by not sliding it around, but I'm worried about something like and explosion with glass shards flying due to the way it heats or something
