One was a dp developments tuned one running about 360bhp, that was bought converted and then died a month or so after, so can't comment much on that, he then had a red one which was basically running an fmic and bleed valve with stupid boost and it ran forever!
And the other was all forged and running a gt28 on omex, built by a reputable tuner but caused all sorts of problems,
As said, the builder has a lot to do with it, some engines seem good, some bad. Just like yb's!