I have the Tan Stock,(not the stock 2,but the older stock with the shorter dust cover).I use it for IPSC production.Ive been extremely happy with it,Ive put about 15K of rounds through it,and it has still to malfunction.Probably its closest competitor is the CZ sp01 shadow,which in itself is a very nice gun,but personally,for $950,the Tan is a better gun.Its got adjustable sights,checkered front and backstrap and a hardchromed finish.I also like the bull barrel which makes it very soft shooting.I also think that the Tans are better made and finished than the cz's(Ive had 3 Cz's over the years).The tans do have heavier triggers than the CZ's,but these smooth out with a bit of use
Ive never owned a sig 226 before,but if you get into ipsc,the stock would be better suited to that game.Still,nothing wrong with a sig for range work
Ive looked at the stock2,which has some really nice features,but I dont think that they make up for the huge price difference from the stock going at $950 which is a heck of a deal