I have just tested the pink fuse in my system. I already had both SR Master and purple. I find the pink to be very good and definitely worth the money IMO. - more dense and colorful than the purple, in some way it can feel like that also compared to the master, but the master is more transparent and dynamic.
SR master first and pink down the line seems to be a very good combo.
I have upgraded my system with ADD Powr sorcer and wizard lately, and adding master fuse to the sorcer and pink to the wizard took them even further. All together that has transformed my system beyond what I thought was possible.