A mate of mine had one of those in 12ga/.222, and I used it a bit. The rifle barrel was very accurate, but the big problem my mate and I found was the fact that the combination of external hammer and side selector prevented instant (or even reasonably quick) availability of the barrel you want, when you want it. Both of us like the combination as a concept, and have since bought Brno ZH series combos, which have two triggers and thus don't have this problem.

I certainly would heartily recommend one of these over the Tikka M07. Mine is a 7x57R/12ga, but they can also be had in 5.6x52R/12ga (my mate has barrel sets in both these combinations) and, less commonly, 5.6x50R/12ga, .22 Hornet/12ga and other combinations.