A decocker IMO is not a negative. Allows one to carry a loaded rifle for extended periods of time more safely. Cocking the barrels only when the need to shoot is more likely.

An excellent feature for a PH who may carry a rifle a lot but not shoot it much. Carry a double rifle with nothing in the chambers is just like carrying two water pipes. Useless.

An automatic safety is a big negative. If everytime the rifle is opened the safety comes on , forget about it. My Jeffery did this and I had it modified.

I am fine with extractors on a big bore double rifle.

One of our early members had a Blaser S2. He could never get it to shoot at all adequately and sold it off.

Blaser stopped making the S2 because they are crap and not worth buying. I think there design looks are off as well.

If something breaks on them and needs repair, can they be repaired?

If I was buying one, I would MAKE SURE it shoots to regulation before committing. One of the common faults as said is they won't shoot to regulation.