Pros:

-Complete Skin Pack (Skins, Icons, Huds ect.)
-Everything works great
-Moving is very smooth
-Everyone holds stuff correctly

Cons:

-Even if it's been turned off in the Addon Manager, Everyone's names stay the same (Atlas, P-Body, Chell, GLaDOS)

Conclusion:

Everything just works and it looks Fantastic! After you fix the Name bug, this will be Perfect!

Pros:

-Complete Skin (Icons, Huds ect.)
-Works Great
-Lots of Fun
-Everything Moves Very smoothly

Cons:

-The Arms Sometimes Twist in Weird ways

Conclusion:

Apart from that small nitpick, this is a great little mod, and is heaps of fun for Minecraft Lovers!

Pros:

-Great Fun
-Works Great
-Perfect for Minecraft Lovers

Cons:

-On a Local Multi Server, if someone on it doesn't have this, they see errors (which is Too be expected)

Conclusion:

Apart from that Multiplayer error, this runs excellent!
I would recommend this to anyone who plays Minecraft!