Oh yeah, forgot to mention that it was the wide neck Dr Browns and BFree that our baby likes, not the skinny ones. The bottles have lasted a year and are still in fine shape, but we have replaced the venting system once As it was starting to look a little worn (replacement parts are easy to get). Also, now that she is older we are using Tommee Tippee and Munchkin sippy cups, but for bottles, still the same. Tommee Tippee baby plates and bowls are very durable in our experience for when baby gets older.
On the difference between Dr Browns and BFree bottles, the Dr. Browns air venting system has two parts, while the BFree has three, so the former is a little easier to wash. But, the BFree bottles are one ounce larger in both the small and large size, and easier to use when baby is drinking 8 oz bottles of formula as there is a bit of extra room for the powder. That said, we finally just got the Dr Browns replacement venting system for the BFree bottles we have and it works fine. Bottle nipples for both brands are almost identical in size and shape.