Hello! While browsing for art supplies I've occasionally run across these things called Dual Brush Pens from Tombow. http://tombowusa.com/dual-brush-pen-569.html
Apparently it is a dual-tipped brush pen with water-based ink. I was kind of curious about 'em. Do any of you guys and gals have any experience with these things? What are they good for? Does anyone like them?
My main interests are SF illustration and conceptual design. Would these brush pens be the sort of thing that could be used for rendering awesome spaceships or whatever? I guess many different techniques and tools could work, so experimentation is good. On the other hand, if they are only for crafty-type things they may not be the kind of thing I'm interested in... but it is hard to tell.