I bought the senco as it is identical,except for color, the dimentions are the same but the specs say otherwise for some reason, the grip rite costs more , both made in Taiwan. $39 vs $44.
I have NR90AC3 , made in Japan, excellent gun but does not work as well with 8D 2 3/8"RS EG. The n66c bostich coil nailer is better with 6D-8D's. I bought that gun over the Hitachi as a siding nailer needs a sequential trip too, which hitachi make you buy a kit as a $40 part . The Bostich gun itself cost over $100 less. I paid $179. Most all other companies give you both triggers.
I have not tried it yet. I could not make myself spend $6 for 1# of 8D nails at Lowe's. They were grip rite brand.