1. Open source. ps2avg can be upgraded at your convenience
2. Multiple Layouts (including arrow keys)64/minila
3. N-key/6-key rollover
4. Programmable with up to 4 layers of different macros
5. Easily programmable, combinations of layouts are endless.
6. One key can fire many keys in a macro
Modify the keys and program: https://blog.winkeyless.kr/183
Software can also be obtained directly from sellers. That's faster.