Bearing knock

I'm looking at buying an 2003 facelift e46 m3 that had a bearing knock. The previous owner said 2 conrods bent. The car is now getting repaired with 2nd hand conrods and the crank being sent to the engineers. The Mac cannot give any guarantees

If this is a shoddy repair job what could I be looking at to repairing this?

Regards
V'Nolan