I have a pair of Under Armour cleats. Every website I go to says they're called the "Youth UA Blur Challenge," but my pair is a size 11...
Anyways, they're sweet. They're super light, the cleats themselves are kinda rectangle shaped as opposed to round, which, in my opinion, offers better traction for cutting. And also, they're sexy rexy!
After a few players recommended the Warrior Burn Speed 2.0, I managed to get my hands on a pair and they're the best I've worn. They're actually Lacrosse shoes but are perfect for ultimate. Super comfortable, great for cutting and very durable. Good look finding a pair though.
I tried on a few pairs of Lacrosse cleats, and I didn't like the ankle support they gave. I like being able to bend at my ankle and they wouldn't allow me to do that.