Went to Sweetwater yesterday for their tasting and tours (read tasting) and they have a Double IPA on tap as part of their "dank tank" series.

More maltier and bitter than their IPA but in my opinion less hop aroma (like if it wasn't or needed more dry hopping). Maybe is just too malty for my taste. Here is a review I found in beeradvocate that I mostly agree on:

"This is the third installment of Sweetwater's Dank Tank series. Had on-tap at the brewery.

Pours a clear light copper color with a one-finger off-white head. The head recedes into a thin pancake on top leaving solid lacing.

Smells similar to their IPA but with more of a malt presence. Lots of grapefruit hop aromas joined by pale malt with hints of pine hops.

Tastes similar to how it smells. Pale malt flavors start things off and are soon followed by lots of citrus flavors. Very light pine flavors join in right before the bitter ending. The ending is a tad more assertive than the IPA.

Mouthfeel is good. It's got a nice thickness with solid carbonation. Since I've compared everything else to the IPA I'll say that this is a bit thicker.

Drinkability is very good. As with the IPA I could drink a lot of these.

Overall I won't say I'm disappointed but I wouldn't have minded a bit more distance between this and the IPA. Better mouthfeel, more malt presence and a more assertively bitter ending differentiate this from the IPA. Definitely worth a shot - hopefully we'll see a few bottles of this."