I have looked at the OPen Range RVs and was pretty impressed with the "what could be seen" quality. I did open doors, storage, etc. We camp with a couple that has one and they love it and have talked another couple into getting one. They are picking it up next week.
You are correct on the outside storage for the 303BHS, We bought this model back in Feb of 2012, my DW loves the floorplan, very spacious and there is plenty of storage inside. You will here horror stories about the cable operated slides,, they work great, just with any type of RV manufacturer, you will have problems, go to the OR forum and poke around, ask questions, of course they will be biased, over all we like this one the best, it will sleep 10 tight but 6 comfortable. from the PU, to the HTT to the Fiver, this one is the keeper! Rusty