If you're not (which would be kind of silly) then yes, you would get higher performance with the newer version with XT-CF cards also.
Already on the Plus train. (It's been a long time since I did the bake-off but my recollection that it totally delivered on being at least 50%-ish faster.) So, yeah, just wondering if the loop unrolling would do anything with the 8-bit hardware. I'm pretty sure my current flash is configured to use one of the "BIU Offload" variants of the CF driver, if that would have any bearing.