My son (and first baby) is one month old and I've fortunately had the opportunity to try a few brands of baby bottles and nipples during that time. These include Evenflo Vented Plus (4oz), Playtex VentAire (6oz), Medela Symphony (35ml) and Pump in Style (150ml), and Dr. Brown's Anti-Colic bottles -- and Evenflo (slow), Playtex (slow and medium), Enfamil (disposable extra slow, slow, and standard), President's Choice (medium), and Dr. Brown's (preemie and Level 1) nipples. The Evenflo and Playtex bottles and nipples have become our unanimous favorite. Our son is a colicky little guy and we've found the vent on the Evenflo nipples and the tilt of the Playtex bottles to work the best for him, so we use both the Evenflo Vented Plus (4oz) and Playtex VentAire (6oz), depending on whichever we have clean at the time or how long it's been between feeds (unfortunately the parts are NOT interchangeable between the two -- but they're both fairly priced bottles at least, so we're in the process of stocking up on both). These Evenflo bottles are beautiful, fairly priced, effective, and simple to use. The ml/oz measurement on the bottle is embossed glass so it won't rub off (meanwhile, one of my Medela Pump in Style bottles is already losing its paint-on markings). They only have 3 parts so they're very easy to clean. The nipples and rings are 'standard' size so they can fit on other things such as Medela and Dr. Brown's bottles -- as well as Nestle Good Start and Enfamil Ready-to-Feed bottles. The glass is of medium thickness and they are neither too light nor too heavy. I'd call them medium-weight. Similar in weight to Dr. Brown's glass bottles. The teal color is unique and stunning! His maternal grandmother calls it his "blueberry milk" because of the teal tint ????. And the nipples -- they're sturdy at the bottom and don't collapse nearly as much as the Dr. Brown's ones do. The vents release bubbles built up in the nipple, and that's pretty cool to see too (my little guy is tongue-tied and has problems latching sometimes, so it's effective in making him less gassy). They have a little nub on the bottom (which is the vent, I assume), that doesn't get in the way of the fit or cleaning whatsoever. Anyway, to close this review, so far I've bought 2 packs of these 4oz bottles and am considering buying the 8oz ones too when my son eventually graduates to those. If you get multiple speeds of Evenflo nipples, btw (I just ordered some medium ones) you can tell which are which by a tiny 'S' or 'M', etc. printed on the underside of the nipple rim. I do wish they made those easier to spot (like the 'preemie' and '1' printed on the upper base of the Doctor Brown's nipples), but I'm willing to live with it because they've lessened my son's colic. Btw -- he seems to be spitting up less with the Enfamil Spit-Up, Similac Total Comfort, and Nestle Good Start formulas. I also pump a few times a day, so 1 of his bottles a day is breast milk. It seems the Enfamil A+ and perhaps even the Enfamil Gentlease were a bit hard on his stomach. Just a tip for any other parents trying to survive a colicky baby who spits up a lot ????????.