I have used scream1, classic ergo 2 and than the Ultralight pro
The scream1 was the worst mouse i have ever used it had scroll issues, slam click issues misaligned feet and so on.
The other two were better but the build quality is even worse than on one of the cheap sharkoon mice.
If you bought one u can be sure that after a while u will get scrollwheel issues.
Only thing that speaks for them is the low weight everything else is shit but i will get back to the shape if the Glorious Odin comes out.