I never use Circle2 because of the tedious UI.
All these other synths (and more ofcourse), as seen on the screenshots, have multiple sizes, are resizable or are just big enough. I really was hoping Circle2 was getting a good UI update as well.
*Avenger is @90%
**Thorn (a new synth by Sches) just got an update from 1.0.0 to 1.0.1 with a nice scalable UI as well.
***I opened Icarus as well. This one is almost just as big as Circle2. But the elements are way bigger. Therefor the usability is way better.
These screenshots are on 2x1080P