I've used glass. No breakages. I used NUK teats with them. No problems. The glass bottles were from Happy Baby, bought from our chemist, cost about $12 but friends who use them say they can be bought cheaper. They are ridged and very durable although i guess you woudn't want to drop them onto cement. I only used them to give the odd feed of expressed milk when DH had to feed when i was out... not sure how they go on a more regular basis. I loved the old fashioned feel of them... I'm not a huge fan of plastic, of any kind.

ETA: never heard anything about not putting EBM into them... sounds a bit odd.