I ran a corporate networking team in the 2000s with two of the five network engineer team members, being two years out of retraining (they were welding specialists in the former local shipbuilding industry). Non-white collar supervisory and work ethic issues, but excellent work in general. Had an issue with the team on-call car getting bullet holes once (suspect some drug dealing on the side, long story!) but excellent colleagues in general.

I've worked with a lot of retrained and second-career people and I can't sing their praises enough.