Everyone complaining about the ASC nipple not being sealed, you should realize there are *no* adult pacis on the market with a sealed nipple. All orthodontic pacifiers allow air to escape, that's the design of them. The official NUk5 is like it too.
Also, the ASC pacis are the exact same size as an official Nuk 5, so I dont understand the complaints about size?
If you have an ASC and the teat is sideways or not put in properly, its pretty easy to fix it yourself. Give the ring a good yank and it will come out of the shield. This should allow you to pull the nipple through properly and straighten it up. Then you just put the ring back in. Simple as anything, I did it on all 5 of my ASC pacis. They are very poorly assembled.
Having said all that, since I got my BabyPants Classic, its all I use. Though I put a Nuk 7 teat on mine. For those wondering, the teat on the "Nuk 6" is about the same length as a 5. It is very slightly wider in the stem of the teat, and has a textured finish to the silicone that I personally don't like. The Babypants pacis also kinda hold air when you first get them, until you give them a really good suck, then they go flat and take ages to re inflate. Its fixable by putting a hole in the backside of the button where the teat attaches, which is what I've done to mine.