Has anyone attended any of these 3 to 5 day courses and has feedback? I'm on my 4th year of commercial service and want to continue to improve my troubleshooting:

Mitsubishi City Multi Training

Mitsubishi Mr Slim Training

Patts Powerflame school

B&G Little Red Schoolhouse

Also, what other courses have you taken that have really helped you out (I'm not talking the little 1 nighters at your local supply house). I'm especially looking to improve with screw chillers, centrifugal chillers, VFDs, hydronics, building automation systems, combustion analysis. I've done service calls on all of these 10+ times, but could really supplement with some instruction.