After what has been said, unless you plan on picking up a frontier or lightjet, you won't be using this at home.
That said, I like prints done on RA-4 paper (through a lab). I think they offer richer color than pigments in many cases and I've had RA-4 prints made at 20"X30" and 16"X20" on Kodak Endura. I get pretty much all of my 4X6 shots printed on this because it is cheaper than printing on my inkjet.
I like the control and choice of paper surfaces on an inkjet, especially one at home. But sometimes the traditional papers like Endura and Crystal Archive are great choices for a print.
Don't worry John, I would have fallen into the same boat. I was looking around for paper for my Epson 1400 and saw that costco used this paper and was looking around for prices and reviews. Whew.