Better tuning and slightly improved sound. Slots are very well made. I'm very happy. (For Aria Pro II PE-800 guitar. Space between slots were a little bit wider than the original)
Little note on the description: I needed to reduce quite some height and I found out that even with sanding paper 120, some effort is still need (you can use finer sanding paper to finish). Also: the dimensions were spot on, no sanding was needed for length and width.