I had a converted saiga I did myself with about $800-1000 in upgrades and it ran, ran, ran... Only problems I had were with smashed hulls in my mags on hot summer stages. Had to make sure to load up right before the stage.
After a few years I wanted to try a tac-12 and did not like it at all. Recoiled much harder and had feed issues.
No I just purchased an Origin 12 and it shoots much softer back like my saiga.
"The Outdoor Office" or "Origin 12" Facebook page has a 100 rd test filmed straight through with ten mags. They have really ran it through the ringer.
Now for competition it is HEAVY. You'd want to see about changing out the forearm at least. 10 rd mags and drums are readily available now.