I've got a West Marine RU260 like some other folks on here. It's an okay dinghy, but far from ideal in my opinion.
First, it doesn't fit on the cabin top of my boat very well. With the high top and the radome bolted directly to the cabin top, the dinghy can be flipped upside down over the radome, but it's not an ideal solution.
Instead I've used a combination of towing the dinghy sometimes and deflating it and storing it in the cockpit other times. It doesn't take long to inflate and it's not all that cumbersome, although it certainly isn't elegant. Towing works surprisingly well at all speeds and has the advantage of being ready whenever. On a couple of occasions the bow of the dinghy submarined, but the water quickly drained with the plug out. Keep in mind this was in some nasty tide rips in Active Pass. The towed dinghy can occasionally get in the way when docking, particularly if you have to change plans at the last minute and tie up in a different place or on a different side. My biggest concern when towing the dinghy is fouling the prop, but in about 1000 miles of towing that hasn't happened.
As far as a dinghy, the RU260 gets the job done. I prefer inflatable floors to the slat floor on the RU260, not just for the weight savings but also because they feel more stable to me. The RU260 rows poorly, but most inflatables do. I've had a few minor holes in mine from rocky landings and they've been easy enough to patch. I bought mine from a neighbor who was moving for something like $50 or $75 and I'm really happy with it for that price. I don't think I'd spend $850 on one though.