That's the hard part right now need to pick mhd/bm3 and find the right tuner. I have access to a dyno so that's the easy part. What really made me get it was the thicwhips video of him at CES seeing the power pump on MHD with the 93+ meth.Meth is definitely fine for cooling, but relying on it for fuel can be a little tedious if you drive the car hard a lot. You should talk to your tuner and see what they recommend for your goals.
Using it with MHD/BM3/Ecutek whatever doesn't matter. You'll use the standalone controller for controlling meth. Your tuner will advise as what meth to use Boost Juice/50/50, M1, M5, etc as well as what size nozzle, depending on your risk tolerance and goals.
I'm using a bit amount of undiluted meth for fuel and cooling, so it's really just going to depend. I start spray as 7psi and full spray at 12psi-- again, talk to your tuner lol.