We bought ours new in 2008 and agree with all the pp's: gas mileage is terrible, I think worse than friends' SUVs, but way more comfortable and smoother driving, tons of room for the 5 of us and all our gear, we just love, love, love it.
One word of warning though... the "service engine" light is erratic. We had a Nissan Maxima before this that did the same thing and we have friends with armadas that also complain of this. Sometimes it'll go off on it's own after a few days, but we have had to take it in other times so they can hook it up to the computer and clear it, which is around $50 or $75 I think. Also, be very careful to close the cap on the gas tank tightly, a few clicks each time, otherwise it'll definitely come on and will not clear by itself.
Also, there was a recall on the gas gauges, maybe in 2009? It wasn't recalled until after we were left stranded on the side of the road having run out of gas though... Nissan called a tow truck for us and they fixed it, then we saw that the recall came out soon after that. So check and make sure that yours has been updated!
Hope you enjoy it!