Highly recommended for the smaller doorway.
581847
I was a little worried that there would be big gaps in between the magnets, but it seems that my doorway was the perfect size for the magnets to clip perfectly together. If your door frame is the max size of this net, consider passing on it. You will want a door way slightly smaller than the recommended maximum if you want it to close well.

It does have a lot of magnets both big and small and I like that the weights in the bottom keep crawling bugs out too. The Velcro is a little weak, but tacks provided did the trick to hold it in place. My dog goes in and out easily and the screen continues to hold well. The material is thick and high quality.
373158
This door is perfect. We inserted one in the wall of the mud room and one in the backdoor for our dogs. We had a problem with our old door swinging open when the wind blew in the winter. Although we have not gone through a winter with the wall door, I don't think it will be swinging open with the wind. The magnetic strip at the bottom of the flap seals very well. We took the extra flap off of both doors. If we need it/them this winter, we can put them back on. Otherwise, we will save them to be replacement flaps in the future. We have two 20 lb dogs, and they go through easily. The wall extender works perfectly for the one inserted in the wall.  I think 25 lbs will be the limit for the opening unless you have a very, very slim dog. I wish Ideal had a large size for maybe up to 40 lbs. We didn't want the XL because people can crawl through them, but the smaller door limits the size of dog we can get in the future. For those of you who aren't very good at handy work, get a skilled person to insert it. My husband is a good carpenter and has good tools. You will need very long bits for the holes (especially in the walls) and some skill to cut the opening in the door.
2087039
Great fit in a small space and looks high quality as well. Recommend you get the cushion.
1196760
It was easy to put up and works perfectly as a small shelf and hooks for items by the door. I like that the shelf is solid and not slotted like some of the others.
3337062
Very Attractive and works smoothly. It was installed in less than five minutes. I chose this lever because I needed to replace the one on a security door and knew by the description it would work on a thinner steel door.
1164401
Great item! Just perfect for the normally wasted space behind the door.
254503
I ordered the smallest size door for my adult cat and it is a good size.  The door is excellent quality and literally anyone can install it quickly with only a screwdriver (to remove the original locking hardware from the frame of the sliding glass door).  I did not use the included lock to prevent the partially opened sliding glass door from being opened, but instead went to a local hardware store and bought a no-drill alternative. Note that the insert needs to be installed next to the INNER sliding door in order to secure the original door from being opened from the outside. As others have said, it is still possible to use the sliding door next to the insert.  If you do want to use it regularly, you might keep that in mind in choosing an alternative locking mechanism. Also, it would be very difficult to remove the insert from the outside.  All-in-all, I am very glad I purchased the pet door and felt it was a very good value for the money spent.
1862683
Everyone loves my new life. Great for a small entryway.
3920751
Love the locking functionality, but the door openings are very small. I still love the way it looks and I'm not worried about my stereo getting stolen.
1616979
This is smaller than a regular door knob but bigger than a small bi-fold doorknob.  I purchased it for my hollow core doors in my garage and it works great.  My hollow door was slightly over 1 inch in depth and the long screw provided allowed me to drill into both front and back and then place a 1 inch diameter washer with a small hole for the screw and it worked like a charm and is securely fastened and looks great.
4568958
Just slightly shorter than the one it replaced (previous generation of same brand) so had to drill one hole.  The thing does actually work well.  It is easy to adjust to close quickly or slowly.  The door stop is a simple 1/4 turn and it stops the door in whatever position it is in.  I am very happy with the product at this point.  From the looks of it, I would say like any small piston, if you abuse it by swinging hard against the lock or push the door with much vigor against it, then I suspect it will give up, and I don't blame it.  It is only supposed to hold the door, not you too.
1098295
I love these.  My space is limited in this home.  Smallest pantry I have ever seen, so now the door is useful as a spice rack!
4271969
The door was easy to setup and held a lot more things then I thought it would. Just make sure you have a 3.5 inch clearance from the wall to the hinge. Would (gonna) buy again.
974776
owned this little door for 3 years now. very good quality door. highly recommended.
1317520
I bought this two pack thinking I would need them both for the same door, but one alone works great, so I have a spare. It's not super intuitive to install but another reviewer gave his overview of the directions and that was extremely helpful (thanks!).

My husband and I installed this on an existing door in about 10 minutes. We just swapped out one of the regular hinges for the new spring hinge and adjusted the tension. It works very well- always closes the door completely. I can manually close the door almost all the way, leaving it open a crack, and it doesn't have enough force to close it from there but if you just open the door and walk through, letting the door go, it has enough force to close it every time.

We used this on a door to the basement that our kids kept forgetting to close behind them. It's just a normal six-panel interior door- very light. On a heavier door I think you would need both hinges, but it would be overkill on this door. Very happy with this purchase.
103594
Although not small or light weight, the folded design is fantastic for small spaces and stairs.  I am short and was able to lug upstairs, unbox and flop it onto bed frame in a matter of minutes.  The folded design makes it so easy to maneuver around house obstacles.
332866
I measured my door, came in at 36x80. Read another review here that said to go with a few inches more than you need and I couldn't agree more. Anything smaller and it wouldn't have worked out nearly as well. The full line of Velcro proved to be important too, as it avoids gaps that bugs could use to get in. We thought about a screen door but due to our style of door decided to try this-- so glad we did. It's not perfect but it's pretty close, and saved us a ton of money over getting a proper screen door. The included tacs were also very important, another 2-4 would've been nice, but I can get those on my own. Couldn't be much happier with the purchase.