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For plastic it's fine. I use a knife like that to cut up space marines to repose them. Don't need a saw unless it's epic thick. Just don't plan on getting the cut perfect, no doubt the blade will go off at an angle slightly as you push it through, but if you're careful you'll get a better result than using a saw.
As ZatGuy said, you need to be careful of slipping when cutting with a lot of force, so personally I use a wooden cutting board and make sure my fingers are well clear of the slash zone so if I do slip I don't butcher myself. I'm not exactly sure what models you are planning on cutting, but being eldar they probably don't have very substantial limbs so it shouldn't be too hard.
You can work your way into it gradually as well, rock the knife back and forth a bit, don't just press straight down hoping to get a clean cut.
For the most part I only bother using a saw for metals and really thick plastics (like trying to cut through a torso or something).
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