The Nacra 500 Mk. 2 is primarily designed as a recreational/learn to sail boat. Think souped up Hobie Wave. A fun boat in a spot that regularly sees 15kts of wind or more I suspect. The 570 I've raced against was quite slow, closer to a Hobie 16 than most of the active boats at the club. Not to say it isn't a good boat, or a quick boat in the grand scheme of boats, but a little bit of a different league.
I'm admittedly biased, but if considering spending that kind of money, I would buy a more modern F18 first (my 2nd boat is sort of for sale, ~$23k, it's a 2022, current hull/rig design, and fully sorted) or if you don't want to manage crew, the A-Cat fleet at WRSC is hard to beat and those boats can be had for ~$10k. There are also Nacra 20's that occasionally pop up for sale, generally for less than $10k.
-Sam