It is very nice and clean. The alternative references are great, Boom Box, car stereo and idock. To me that is worth the upgrade price alone. But there is more. How does it sound? Better with new measurements. And less cpu usage on my system and project, This will vary because tons of factors. Like 2-3% less = not a whole lot.
I ran test and when you use the old legacy measurements basically all the new options are grayed out and you might as well use Arc 1. The curves and measurements are identical. But the new Monitor feature is great!
But with new measurements- Which took much less time than the originals. The target curve was almost perfect. Which sounded tons better than the old measurements. On all my new measurements I was able to get to the target curve, you can't tell the difference between the white and green line. In ARC 1 I always had three lines and felt it could be better. Now they have reached that better point!
I strongly recommend redoing the measurements, for sound and extra options. I A/b them and chose ARC 2 every time.
I am just a studio owner, with songs to be recorded. Not affiliated with IK or anyone else. Just a customer who uses it daily, and my demo's have improved greatly since the use of ARC. Thanks.