I'm so glad you posted this because I was about to ask the same thing. We use the Tommee Tippee sippy cups because they were on sale at Babies R Us and I love them...more so than the Playtex ones I've used for 4 years. I used Dr. Brown's with both of my kids and liked them because they helped with gas, but the parts are such a pain. Any time anyone else watched the kids for us, they had a hard time assembling them and then they would leak. You almost need a training class to use them. I just registered for the Tommee Tippee bottles and I hope they work out well.