i have been using tommee tippee for my boy since born till now he is 8 mths old. so far no problem at all. the teats is anti-colic so i dont think its the bottle problem that causes baby to be colic. must get the teats with a hole one. i tried the one without hole and my boy had a hard time drinking, the one with hole is easy-vent so much more smooth. You can get it from kiddy palace as well..
i've been using tommee tippee bottles since i introduced a bottle to my girl when she's 6 weeks old and she loves it. she transition between bottle and breast very easily no rejection no confusion etc. Tommee Tippee bottles have anti colic vents which i feel is good. my girl never had colic problems.