I bought a smokey joe off ebay last week for 29.99 and it was brand new and in the box. It has a letter stamped on it "E" so that would mean 1983. I will post some pics later
I usually take the whole thing out to use my chimney starter and then i use the grate lifter to add coals. The chimney starter will not fit down into the pie shapes, that is the only drawback.
I used my new ci grates last night to cook burgers and they worked great. The grill marks looked perfect. Will use them tonight to cook a big new york strip!
Frank I think the cast iron grates are worth it cause they cook evenly and it makes the food look nice in the process (grill marks). So I would say aethetic and functional. I am very happy with my new grates.