There is a small lag, so if you want the ink to keep up, you have to write slower, but if you just write away, it's quite comfortable. Also, it can't be calibrated currently (so it seems, I don't know if this will be fixed or not), so you have to make sure you hold it right; in my case, NOT totally upright, but in writing position, so if I forget and hold it at 90º for some reason, the line appears at the wrong place (but you can always erase and try again).
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