The TSO and TS2 are what CZ calls their large format magazine pistols. Not compatible with regular CZ75 mags that are cheap and abundant. I have shot a buddys TS2 and I own a Shadow 2 and a TSO. TS2/TSO is a bit more heavy, incredibly accurate, very fast shooting and a better trigger then the Shadow 2 with the TSO trigger being VERY light. The Shadow is a great value under 1k.What do you think of the ts2 version? It's $300 more. The one I saw doesn't have optics cut slide but does have SAO trigger. I don't care about the flared mag well. Those are the two differences I noticed but don't know much about it.