One thing you must remember is that all the performance charts are based on a "SPEC" engine.
Therefore if you have an engine that is failing the power assurance check the durned thang ain't going to perform as advertised.
Not a big problen going from A to B at the same altitude but you could have a problem going to a higher altitude or in such things as OGE hover.
I have seen the result of a compressor stall on short final and it was not pretty - the 206 was definitely not serviceable afterwards! It was even less serviceable after it was dropped from 2000 ft by the 205 slinging it out of the bush!
I think it would have been cheaper to replace the engine after it failed the power check.