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I'm impressed!  For low poly modeling, it looks like it has the tools to do great models, but if you don't have a capable smartphone, or if your fingers are too big, I can see it being a struggle.  I have thick fingers, and using on-screen keypads are a pain in the ass to me, let alone modelling details.  Great technology, but it would take a lot of getting used to.  I'd like to see someone working on it live.

So have you tried it? - In Spacedraw, the sceen essentially works as a "trackpad" to move the picker to select, or the tripod to transform - you don't have to tap elements to select them (although you can) - simply release the touch when the desirerd element is highlighted.

Also I'll soon add stylus support that will make some things even more convenient.