The Hubba Hubba is on my list of tents to look at more closely as well.
My main concern with it is the all-mesh tent body, but I'm honestly not sure how valid my concerns are in this regard. My thinking based on the research I've done so far leads me to think the all-mesh body might not be the best choice for when the temperature drops (i.e., the early/late winter camps) or when (not if

) I get hit with a nasty storm (hard rain/wind).
It also doesn't have venting in the fly, but my understanding is the all-mesh body compensates for that.