Very, uh, classic design. There are a lot of rechargers and powerups you don't often see in multiplayer maps. Lots of winding stairs and long corridors. The only map that really stands out is the one with the river running down the middle.
There are plenty of weapons and ammo scattered around, which makes these definitely playable compared to older maps, but the rest of the design can't keep up with modern packs.
My first map pack comprised of eight maps. All of them work with EMFH, KOTH, and KTMWTB.
One thing to keep in mind when playing the map "Puddle of Goo" is that the hill is on both sides of the goo.