TheFlyingGerbil

I've used the free version and found it's sufficient at making 3D. (Though all the downsides of anaglyph 3D). It does knock your framerate a bit so you'll be on older titles. Not sure if I'd pay £280 extra for the privilege though.

I know logically I probably shouldn't get it, but... I find it hard to resist over-speccing on tech products.

I'd say no and spend the £280 on just filling it chock full of games. You'd get much more out of them then a few more lines on the display n 3D.