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I initially thought this product was a really good idea, but upon actually testing it out I found that it hasn't been executed well – in short, it doesn't really work.
The big selling point of the Inkling is that you can use it wherever you want, drawing on actual paper with actual ink, and have the pen remember your lines -in layers-, in relation to the little clip that you place upon the paper. This is the part where it hiccups.
The layers simply don't tally up.
For example, if you're drawing the outline of a face on one layer, then switch to the next layer to draw the features, these features will invariably be offset by a few millimetres. Which ruins the whole thing. (I have written a longer review about this, with pictures included, on a site called Dork Adore – http://www.dorkadore.com/gadgetry/wacom-inkling-review/)
I did consider that this may just be a problem with my trial version of the pen, but looking around online made it apparent that this was a common problem. This is a real shame as otherwise the product would have been very good!
Other than the layer situation, the Inkling works well enough. To use it you take your piece or pad of paper, then attach the little sensor clip at the top, and proceed to draw in the A4 space beneath the sensor. Your lines get picked up and stored until the next time you upload them to the computer.
The lines that emerge are not perfect – they're a bit sketchy and not always entirely fluid, but this isn't much of a problem as you'd likely be using the sketch as a template to elaborate upon later.
To summarise: good idea, poor execution; layer function doesn't work perfectly as layers become offset