I generally dislike most eeveelution ships, but this one is the best of these, and among one of the best ships in general. Espeon and Umbreon don't have much alike, but their synergy is incredible, contrasting in such a perfect way while still being KINDA similar. 

Gets a point off for being super obvious, but is regardless a combo that works very well. No wonder this pair is so popular.

9/10.