I have tried MRP and don't like it. I still have some left and will continue to try it because it must be me not the paint, judging from other comments here.
I do love the idea of straight from the bottle, I currently use Mr Color Levelling Thinners with Tamiya and Mr Color paints. I measure the quantity of paint and thinners using a syringe, so I can get pretty accurate mix to suit my technique.
With MRP the pigment settles out quickly at the bottom fo the bottle and required a lot of work to get mixed again. With my Tamiya and Mr Color paints, this is much less of an issue and they are easily mixed using a stirrer.
You can't touch up with a brush with MRP paints. I understand they have a different type of paint for this, but I can use the same Tamiya or Mr Color paint pot for both.
I have not cracked the pressure setting on my airbrush for MRP, but my gut instinct is that I am still using too high a pressure and that MRP only needs the bare minimum to push it out of the airbrush.
Last time I used MRP, I got small areas of paint lifting after masking. The paint had a long time to dry before masking, so it wasn't uncured, it just didn't stick. That was unexpected.
MRP paint smells. I guess this is down to personal tolerances, ventilation, etc.
To my eye, MRP paints look pretty accurate in the colours I am using (WWII RAF) but that is a minefield. My approach these days is to get the colour to look right to my eye because that is all that matters for my hobby.
I can't get MRP paints (or Hataka) shipped to Singapore. That is a big disadvantage.
In conclusion, ignore me because I seem to be an outlier. I am sticking with Tamiya and Mr Color because it is cheaper and I know how to use it much better than I do MRP paints.