I've had this installed for one year now and 2 of my 3 dogs use it many times a day. One of my dogs is really shy/skittish and hasn't used it yet, but I haven't spent enough time. It did take the other dogs a little time, but my outgoing dog had it down in a day or 2. The middle one who is afraid of her tail at times took a few weeks with training and I had one door on for a while with less magnets to get them used to it (all magnets are back in now post training). But, this solved my problem of having an adult dog who has some bladder issues and needed to go outside regularly. Honestly, this thing is very slick. I have the double flap version since I live in Wisconsin and I've had no bug issues, no water issues, and no drafts. In the coldest weather, like 0 and lower it does get condensation and frost around it on the metal frame. We had -20/25 and it was frosty but so are my windows at that point. I just make sure to check it for moisture and dry it off until it warms up more. For most days in the winter its not frosty on normal days 10-30 degrees. You can just feel some coldness around the corners, but its not bad at all for what it is. It does a really good job of magnetically sealing the door shut and its not that cold in winter unless its extreme here. I would categorize our use as pretty high because my dogs like to go bark at anything that goes by, so they run through it regularly. My work from home desk is right next to it and I haven't noticed much difference in temperature by it. I had to have someone install it for me who was better at this stuff, and it took a few hours, but I would do this again. Thank you for a great product.