Pros:

+ Ponies (specifically, Rainbow Dash)!
+ It has a cutie mark! (Then again, all the weapon skins do.)
+ It's a guitar! (But you knew that already)

Cons:

- The frets seem too colourful for me, but I'm sure I'll get used to it.
- No picture.

Conclusion:

A worthy addition to my steadily-growing collection of pony weapon skins.