Has anyone had any real time, long-term experience with this product? Have you installed them on inboard, outboard, or both?
yes, I have them on all my cars and have since they first came out back in 2005 or so, the owner Marc Newburger is local to me and he had one of those forum special pricing sales when he was first starting the business, before he went on Shark Tank and got major funding from Lori Greiner. I bought several at that time.
my impressions: Initially the first run of the product had some issues (circa 2005) the seam stitching would pop open from the squeezing pressure put on the device around the seat beat buckle. That issue was fixed eventually and since 2010 or so I haven't had any issues.
I've had them in 6 of my own cars and my wife in 2 of hers, I did move them from car to car, but over time they do get a little "ratty" looking. they are machine washable, but when you have a new car it's nicer to have new accessories.
overall it is a great product, aside from preventing things from falling between the seat it also keeps the seat belt buckle raised up and away from the console where they tend to rub and scratch over time.
The only caution I have for them, make sure that your or who ever details your car, removes them and vacuums around them and brushes them off, over time things get wedged between them and the console, especially if you are one that eats in your car, and since they wrap around the seat belt, movement of the seat will scratch the console as a result of them having crumbs or whatever wedged in there.
They are black Neoprene filled with polyester fiberfill so they are flexible and washable.
I recommend them, they aren't cheap, but then they aren't cheaply made either, and my experience with the company is they are very good at taking care of issues, when I reported the issue of the stitching popping they sent out replacements immediately.