I bought 10 rolls of it in 120 and it is ok. The main issues with it in 120 are the thick backing paper, and how bad it curls. I have had that stuff hang, weighted, for a week and still curl like the Dickens when I took the weights off.
I have thought about getting some for my 4x5, but as I got a pack of FP4+ the other week I will be working on that first.
ive used it no problems i bought if as practice material to learn LF (4x5) and having played with it a bit i see no reason to use any thing else and ive just bought some 5x7 for my "new" ansco
I did the same as David. I bought some Shanghai GP3 in 4x5 to learn on, but liked it enough to pick up a couple hundred sheets. It's available from Isaac Chen on ebay and after shipping it ends up being $100 CDN for 125 sheets to my door in Canada. I find it has a bit of a Plus-X feel to it.
ive used it no problems i bought if as practice material to learn LF (4x5) and having played with it a bit i see no reason to use any thing else and ive just bought some 5x7 for my "new" ansco
I shoot Shanghai GP-3 in 120 and like it alot. I don't think the thickness of the sheet film will present any problems. I am planing to buy some 4x5 in the near future, let us know how you like it if you buy some.