I have printed on Buildtak extensively and I have to say it does work extremely well. The problem I see is that it's largely only good if you're printing with rafts. You align your print head a little closer than normal so the first layer gets pushed into the pours on the Buildtak. At least that was my experience. You could print without a heated bed this way, I printed with ABS without a heated bed and had practically no warping. But again, this was printing with a raft.