Works great for cleaning my glasses with a little water and dawn dish soap. Way better than traditional cleaning and it's a set it and forget it kind of deal. It gets all the oils and dirt off of them and has not scratched or affected the coating...
I use these to give my rabbit her liquid medicine twice a day and they work really well. No leakage or issues in any way. Suction is great as well. I tend to use them a couple of times before tossing them. Living on a farm with animals you never know...
My son wouldn't accept to take any liquid medicine, but he gladly drank tea with this syringe so I am pretty sure he'll be fine getting medicine as well.