I have had this dog door installed for about a month now and I couldn't be more impressed. The build quality is exceptional. I have had PetSafe doggie doors before, both standard and extreme and this one is on a completely different level. I know it's expensive at $300, but it is well worth it based on build quality, looks, and most importantly the seal. My dog door faces due north. This weekend brought weather in the 10's-20's with winds over 30mph and standing on the inside of the door there wasn't a draft. The PetSafe Extreme doggie door that I had previously would flap in the breeze with winds like that, but this one's magnets held it completely tight with not a bit of a draft. I was so impressed.The only thing that takes some getting used to is the snap of the magnets when my dogs go out the door. It is a sharp snap, not the sound of flapping plastic, due to the way it closes. That is completely acceptable from me due to the fantastic seal. If you have any concerns with energy efficiency of your pet door or drafts from wind blowing in, buy this door. It is well worth the money.This doggie door even looks professionally done and well built. It doesn't look like a cheap piece of plastic stuffed in a hole cut in your door. It looks intentionally put together, and the smoked plexiglass for a door lock insert is a very nice touch. I will update this review if the thing doesn't last (I've only used it for a month with two 25lb. dogs), but I firmly expect it to last for years based on the build quality that I can see.2 Year Update: Outstanding build quality. this is the best dog for ever. I've had it installed on my north facing door for two years now and I'm as happy with it today as when I first bought it. Yes, it's expensive but it's so durable. Two years of daily abuse by two to five dogs blasting through the door at full speed and it still seals as well today as new. It gets dirty, so I clean it. There is no draft, no adjustments needed. It makes a fantastic seal that has stayed 100% sealed in 60+ mph north winds.The only negative that I can find is the sharp, loud snap when it closes, but that's what makes the seal so good. Highly recommended. Love it.***** 5-Years Later - This dog door is outstanding. I have had two dogs sprinting through this thing daily for more than 5 years now and I haven't repaired a single part. The flap and magnet are much dirtier than the day I bought it, but that's all. Nothing has frayed or cracked and the door works the same today as day 1. I would say I will buy another, but it's not looking like I'll ever have to. The quality is impeccable. The magnetic seal still snaps tight and holds up to our high north winds without a draft. I'd give this more stars if I could.