It's fast and worked well for us during our trip to the Poly. However, we used it for the BLT resort in June and we had major issues with our view/room category. We eventually changed rooms but it did require a phone call, a trip back to the front desk. I've seen here where people want a room on a high floor, say above the 6th floor. When they've checked in personally, they work with the front desk that instant to negotiate a more favorable room. I've never done that when I checked in online but I'm wondering if it's possible?
If it is possible to negotiate a room request during the online check in, at the resort's front desk, then there's no negative to on-line check in, IMO.
I think I showed my drivers license. They already had my CC on file.