What the people in this thread is saying is totally right. In my testing, having Umbreon and Espeon take up half the line makes it TOTALLY hard to even come up with a good attacking force. While the opponent might have Gardy/Gallade/Dusknoir, you just have Glaceon, Glaceon, and that's it. You could attack with Espeon/Umbreon, but you'll have to waste a DRE and a turn attachment on it just for them to get KO'd next turn.
I would never run Glaceon and Leafeon in the same deck. Two totally different strategies (disruption/energy acceleration).
I miss the old eeveelutions. They were so much better than the ones we have now (other than being ex's).
I'm not saying the cards aren't good, but compared to the recent dominating decks, I don't see them at the same caliber as them. You might be able to tech to beat Mag or GG, but I don't see them beating good decks you don't have the exact weakness to. Glaceon doesn't do enough damage, Leafeon doesn't have any disruption. It's just weird.