Back Seat Extender really adds a lot of room for my 65lb English Bulldog. It has supported her weight thus far with no issues. We've only had it 3 weeks, so we will see how long it stays sturdy.All the seams appear well manufactured. There isn't much cushion, but a blanket or bed will solve this issue with ease.My dog LOVES the extra room. She was a bit short on room before. The seat just isn't wide enough for her to even easily turn around without a leg slipping off.I love the mesh in the center that allows air flow. English Bulldog's don't tolerate heat or cold as well as a lot of other breeds.The extender fits my 2010 Ford Fusion wonderfully. We did measure before purchasing. Instead of measuring the actual seat, we extended the measuring tape to the dimensions of the product to see where it would be inside the vehicle. Perfect.I like that you have the option to fold up one side and still use the product in case you need a spot for someone to ride in the back seat and still need to use the extender. It's not ideal because of the way it folds; parts of the product aren't fully out of the way and the folded part is quite a bit thicker than the single layer part, but definitely doable in a pinch. And, if you need to remove the extender completely, it comes with its own storage bag. Just toss it in the trunk and it's handy to reinstall when needed.I really struggled with giving the product 5 stars or just 4 stars, and here's why:I'm not sure why the clips for the front seat headrest are metal and the back seat headrest are not. To save money, maybe? Clips getting too hot in the sun, possibly? Without knowing the manufacturer's reasoning, one can only guess. I just don't think it would've cost much more to have all the clips metal and I believe the metal clips would be safer and more durable.Since the supported base is flat, it lays according to the slope of the seat. I put a rolled extra large beach towel under the extender to make it more level. Works fine. Something like a really long microbead pillow would probably work better, but I don't have any that large and I didn't want to spend the money to purchase any just to try a theory when the towel works as well as it does. It would be nice if there was a built-in function to help hold the extender level that was flexible enough to fit a variety of vehicles... like the microbeads would do.The biggest issue I'm having with the product is my dog jumps into the floorboard and then up into the seat. Picking her up and putting her in the vehicle is an option, but she is a rescue and has high anxiety issues with being picked up. Trying to put a 65lb flopping bulldog into a car's back seat while bending over and forward isn't the easiest task. So, we go through the process of unbuckling, unzipping, folding, unfolding, zipping, and buckling one side of the extender every time we put her in the vehicle. What would be nice is if the "flaps" that are on each end that protect the doors had the same support in them the base does. Then, we could just fold the flap down to meet her stairs and it would bridge the gap between the stairs and the back seat. So, I am going to add that support myself. Would be an amazing upgrade if this product had such an option for our situation.I went with 5 stars because the product really does what it's intended to do, is exactly as advertised, and it really is a nice product.Overall, and after short-term use of the product, I do recommend it.UPDATE: I've had this product over a year now, and it is holding up wonderfully! Not a single stitch broken! The sole issue is the plastic clip on the side we load and unload the dog on broke within 5 months. I replaced it with a metal clip. The plastic clip on the other side is still intact and functioning - but it has only been unclipped and reclipped a handful of times. I am still VERY pleased with this purchase and still recommend it.