You're pretty brave buying a hop in bulk without ever using it. That said, here's what Brew Dudes said about them:
"Yeah, I am on the Citra hops bandwagon. I don’t even know that there is a bandwagon…
I read in BYO magazine that Sierra Nevada is using this new hop variety in their Torpedo Extra IPA. Of course, I want to get my hands on some. I don’t think that they are widely available for homebrewers just yet, but here is a compilation of the information that is out there about Citra hops:
Hybrid of a number of different hops. The breakdown is as follows:
50% Hallertauer Mittelfrüh
25% U.S. Tettnanger
25% East Kent Golding, Bavarian, Brewers Gold, and other unknown hops.
Origin: USA! USA! Presented at the World Brewing Congress in August of 2008.
Aroma/Flavor: Lots of descriptors out there: Citrus, peach, apricot, passion fruit, grapefruit, lime, melon, gooseberry, lychee fruit, pineapple, mango, papaya and other tropical fruit flavors and aromas. So, ah, fruity.
Alpha Acid: 10 to 12%
Typical Usage: I wouldn’t say there is a typical usage yet, but Sierra Nevada is dry hopping them in their Torpedo Extra IPA. Walla Walla Brewers made a fresh hop beer with all Citra
hops from Hop Union. It appears that Hop Union also had them at their table at the Philly Craft Beer Fest.
Beer Styles: So far, IPAs. Looks like the Washington Homebrewers Association got there hands on some in late ‘08 and they were brewing up some strong American and Belgian ales with them"
Seem like mainly an IPA hop and not really something you can use as a substitute. Although I guess you could use it as a sub for any of the varieties that its been bred from for similarities...