The PLU ML-87 has very good build quality, but it's definitely a 2-key rollover keyboard. If you don't NEED n-key rollover, it's a great keyboard. The ML-87's matrix is better optimized than most 2kro boards. The WASD cluster in particular is very well laid out, letting you hit WASD all at the same time, as well as most neighboring keys. The arrows aren't highly optimized, though, and it's not possible to press all 4 at once. Some combinations of 3 (left-up-right) work, and others (left-down-right, for example) don't.