Woodchuk,
I have no experience with the .22, but the Sig line has overall been very impressive to me. The weapons are well-constructed, and I have never heard a bad word about them. Seems to me it would be safe to assume the construction standards would apply to all of their weaponry.
My Sig 220 is one very nice, reliable weapon. I won't ever trade it off. I've got pistols with more power, more accurace, and more capacity, but I don't have one that's got even two of those over my 220.
~Robert