Pretty amazing part.
Those guys at TI are always coming up with the best stuff, generally their switches are really good. I took a look at the data sheet for the 30A part. It's an N-channel pair so you're limited to certain types of controllers with that. A lot of them are using NMOS rectifiers now so it's probably not a big deal.
It would have been better if the pair was matched a little closer, but I guess that's a space saving thing. The gate charge is a little high on the rectifier and the on resistance is a little high on the energizer (relatively speaking). I'd rather have a more matched pair with a more median trade off for gate charge and on resistance. That's always the trade-off, gate charge for on resistance. You don't want to go too high on either with a converter. High gate charge reduces switching speed and increases load on the gate driver. High on resistance increases power loss and heating.
This part would actually be better;
http://www.ti.com/product/csd86360q5d You have to reflow solder the version II part which can be a limitation for a hobbyist. The 5x6 SON package can be soldered by hand with the right circuit board layout, just need a couple big vias under the center pad. Also, that part I linked has better specs. You sacrifice some performance for that extremely small form factor with the version II.
I've looked at those Power Block parts before, but I hadn't seen the new version II parts. If I do a design with a different controller that uses an NMOS pair, I may use one of the 5x6 SON parts. The controller I'm using right now uses an N-P pair. That part can also be used for a booster. The only difference between buck and boost is which side of the inductor the MOSFET pair is connected to.