It is a very accurate emulation with a few extra features like LFO sync and up to 12 voice polyphony. It can even import .syx files from a hardware JX8P. If you use a computer to make sounds or music at all, you need to download this.
The only extra features on a wishlist would be a fully resonant filter option, a higher LFO range, and more LFO shapes. That may break .syx compatibility too much though. However, it does have a legato mode! That was missing on the real deal.
All of that said, this is without a doubt the most accurate JX8P emulation. It gets a 10/10 from me.