Pros:

- Very good adaptation of the real rifle.
- Very good animations.
- Realistic weapon sound.
- XM8 is a modern gun with a modern and beautiful design. 
- Fits well in the situation.

Cons:

- No reload sound, but don't take off the bright of mod.

Conclusion:

 For me is the best substitution of the M16 gun I found. It make me remember when I played Bad Company 2.

Sorry my poor english