No, just went for a 7200 rpm one.
I remember reading conflicting opinions on the fusion drive efficiency, so I decided to save $200. The way I work, I am by far the worst bottleneck in the chain, so a few seconds here and there do not matter much to me.
The worst time offender for me is not how fast a program loads (which, as far as I know, is the fusion advantage), but the time it takes for a Lightroom adjustments to become visible on screen (with which, again as far as I know, fusion does not help much, if at all). I am hoping that other system elements, like a jump from my current 3 GB memory (iMac 24) to 8 GB (with a planned jump to 16 or 32 at some point), newer processor, newer video card, etc., will create a more comfortable working experience.