I like the blending tool, it's comfortable to use and hold, but the velcro sticks like crazy, I had to reglue the velcro pad to my tool. I would like to get a few more tools if I could get them half off, if I get energetic I may make my own.
I do NOT use a separate sponge for each color. One for blue, one for red, one for yellow, one for brown, etc. I try to keep lighter colors on one end of the sponge and darker colors on the other. Any unintentional blending that happens is part of the distress look, imo, and adds more depth.