My XP static tried out hippos in Grauberg (S) tonight, and I have to say I'm in love.
http://www.hot-hot-hot-catlove.com/f...ippoHeader.jpg
We don't have an uber setup -- our intent is to spent time together and level jobs we want to. PLD, WHM, SMN, BLU, (BLU filling in for our THF), and COR (me). All level 66. I think a PLD tank is probably a must, the hippos were either attacking really fast or tripple attacking on a regular basis.
Hippos aggro, have amazingly limited true sight, and seem not to link (though I wouldn't bet money on that last one). They have MP, much to our BLUs' happiness. There are
17! of them in the room just west of the Campaign outpost guy, so it's really easy to get to and you won't run out of mobs. (There are eles in the tunnel on the way there, and at night there are two undeads.)
I saw no good camps, so you have to remain pressed up against the wall. (We did that right next to the tunnel.) We got no links/aggro that way, even though a few hippos wandered by now and then.
They have a TP move 'Fantod' which acts like Boost and did up to 800 HP damage. (It was our PLD's first death since the 20s.)
We felt like 66 was a little low, 67 would probably be better. XP rocked though, 200-300 for a not-long fight (I wouldn't call it fast, but for that amount of XP it was shorter than usual).
We'll be going back there for as long as the XP holds out.
Oh! And if you bring a COR, you'll get fun bugs like this:
http://www.hot-hot-hot-catlove.com/f...8-HippoBug.jpg
I'd do a roll, then the hippo would erase it while I was doubling up. The text is the minor part of the bug, the more annoying part was that the game acted like I really had the roll on me, so I got the 'can't roll while that's active on you' error for three rolls at a time (which is of course impossible).
Edit: Grammar.