I used Tommee Tippee with DD1 and Plunket Chuchu teats - never had any problems with alternating between BF and the bottle.
Because of my increased paranoia over chemicals this time around I'm going glass - and have bought a few Evenflo glass bottles. Will have to wait and see how they work out.
ETA: I also used medela for my expressing - and just defrosted the milk and tipped it into the bottles (from the plastic bags) as needed.
Sorry I'm not much help.
Edited by VannesaD