I love short, slow thrusts. I also like to insert a thicker glass dildo and let it sit there while I use a vibrator on my clit and work my muscles around the glass piece. It gives me some amazing orgasms.
They're made from Pyrex Borosillicate and all the companies that are offered here have been at least twice annealed (heat and pressure treated to be certain there are no stresses). What this means is that in nearly all instances, there needs to be "the perfect storm" of conditions in order to chip them - and they will bounce off of nearly every surface, including cement. While it's not advisable to throw them around, and you should always check them if you drop them, it's not a huge deal if they do get dropped unless they're hollow (a rarity).
If you're using one vaginally, be careful not to thrust too hard into your cervix because the toy can bruise it! Ouch.
I'm new to glass and am curious about what techniques people like too.
I just tried my new Amythest. I think for me there will be a learning curve to glass gspot toys. I tried twisting from side to side, rocking the handle up and down, gently pulling at the gspot with the tip, and slow, shallow thrusting. I liked all of these but the slow thrusting seemed to work the best. Although, I didn't feel like I hit that exact right spot in just the right way. It wasnt one of those "I found my g spot right away" things like many seem to have with that dildo. I didn't ever feel like I got my g spot in that way that makes you feel like you have to pee. At one point I was really concerned about inserting it too far. I'm really afraid of hurting my cervix, but it was ok. I hope others leave more tips. I'm very interested to see how others use their toys.
Re: the cervix issue. I purchased a silicone cock ring to put on my glass toys to make sure I don't get carried away and bruise my cervix.