I know this is a bit of threadomancy, but I've had the chance to see and use the item in question for myself and wanted to share my impressions should anyone have the same dilemma as I had back in December.
(I will for the moment disregard the fact that I've ordered the tool - along with a couple other things - in late January and it arrived this week... go figure)
Disclaimer: so far I have been using a regular hobby/craft knife with an extendable blade and, well, suffice it to say that while it is practical, the handle is really comfortable. Overall quality of the remover is also quite high - although it comes in a slightly flimsy plastic container, the tool itself is top-notch.
As far as working with materials, so far I'm under the impression that it's actually easier to use it on plastic than the regular hobby knife - not to mention that with the knife getting to some of the lines is tricky, but the rounded tip of the remover is great for even the most hidden mould lines. Also no risk of stabbing yourself!
I have no idea how long it will last and whether or not I will have to sharpen its edges at some point in the future, but so far so good, I highly recommend it, great utility for a reasonable price.