We did exactly that a couple weeks ago. We stayed there the night before checking into POR. It was OK. Kind of chaotic for me, but was worth the price by far. No hidden fees, actually was less than quoted. Just that resort fee that they tell you about when booking. Didn't use their transportation, just went to downtown Disney and drove. I would say it's worth doing for a night before, but was very glad we were checking into a DISNEY resort next day.