We have used an inflatable for years on the rugged beaches of the Northwest. The key is to get a one made of real inflatable material. Early on we had (still do as a kids water toy) a Sevylor vinyl boat, low priced and you can tell why. This material has to be treated gently, nothing sharp, don't leave it out in the sun.
The ones made by zodiac (PVC Decitex polyester) or the ones from Avon (Hypalon like mine) will last for years of rough handling even on rocky, shell (Oysters up here) covered beaches. Bump and bang docks, the motor or prop without any wories in these boats. They cost more, but in the long run are worth it. Unlike the previous post, a good marine dingy does not have to be babied.
Ours is BoatUS by Avon, 8'6" slat bottom.
Here is slightly smaller two person 6'7" one of the same design. The slat floor makes it real easy to deflate, roll and stow. Doesn't plane, but will handle a 4hp motor with ease. We occasionally use a 6hp on ours, but mostly just row it. Only weighs 44 lbs and at $679 is more than you want to spend but you won't regret it later.
The bad think about the walker bays is storing them on board. You can squeeze them on upside down on the bow but it's a pain. Towing it all the time is also a pain. I find that at any speed faster than about 12 knots towing any dingy is to much trouble. We often pull ours up on the bow if we want to go fast, which is often. It fits there inflated great, and is also easily deflated or inflated on the bow with a simple foot pump.
We almost bought a windglider last year as a toy, but I don't think I'd want to use it for dingy duty. I can't see hauling water, gas and groceries around on it. It does look really fun for play time though.
