We have had 4 Chicco Nextfit's. We first bought one for each of our two cars, 2 years ago.The little push button that you push to loosen or pull the strap to tighten started to pop out. It would pop out every time you got the straps snug (and this was an arguably difficult seat to get the straps tight), making it very hard to tighten the straps. You could push it back in, but it wouldn't stay. After a couple frustrating weeks of dealing with that, Chicco sent us a replacement seat, free of charge, and we returned the defective one. About a year later, we were in a car accident, and our car seat was "totaled" by insurance, so we got another seat. This time I bought the super duper cushy one sold only by Babies R Us (the "Zip?"). Now, THIS seat is having the same issue with the push button popping out. Not to mention, it seems like one of our straps has gotten twisted somehow, and I don't know how to fix it. I haven't tried to take the cover off, but I'm so frustrated with this push button thing that I don't want to buy another Nextfit for DS #2, even though I've really liked everything else about the seat. DS #1 is still rear-facing, so I think the angle that you have to use to pull the strap to tighten it puts more strain on the button. I guess I'll call Chicco and complain about this (same) issue, but I'm wondering if it's just a fluke I've had, something I'm doing in particular to cause this to happen, or if it's something that has happened to other Nextfits? The seat is still useable, but I don't have enough arm strength to get the straps tight enough with the "pinch test" and hold the stupid push button in so it doesn't pop out at the same time.