Several years ago I had a Hayabusa +5mm weld up stroker done at Falicon...great service and communication. They also repaired a rod journal a couple of years later on the same crank after I threw a rod due to an oiling issue not their work. Again, great service.
I bought a billet +10mm stroker for the Busa from APE. I've bought alot of parts from them over the years for various street & race bikes, my experience with them for parts and service has always been great.
I had Marine de-stroke a Honda 600RR crank -7.25mm for a 500 turbo project. The work was completed on time, as promised. Marine did take on this project when their competitors wouldn't, so that makes them winners in my book. We recently sent them a Busa crank to get de-stroked for another project.
I suppose when a company is not willing to do a job, it is because the possibility of failure might reflect on them poorly, you have to respect where they draw the line with modifications that they are comfortable with.
Unfortunately Slim had some bad luck with the lead time overseas. I would not hesistate to use Falicon or APE for conventional crank work. I think when you need a crank shop willing to "think outside of the box", Marine is my choice.