Melanie, I looked at the aria when I was shopping for a double stroller, but I bought a Maclaren Rally Twin (it is the cheaper of the 2 maclaren side by side doubles). I have had it for 3 months and so far it has worked well. I think there are some features better on the aria and some better on the one I picked. But, overall, I think the frame on mine is a bit sturdier (the aria was wobbly from side to side - probably due to not having wheels in the middle which some see as a pro, since you can bump into them, but I never bump into them anyway) and the seats are slightly wider. Plus, it depends if you like that bar across the front of the seats. The Rally Twin doesn't have it. Also, mine has pushing handles and the aria has a bar. It depends what you prefer. I find that I can still push mine one handed. Anyway, hope you got something helpful out of my blurb here!
Oh, the best price I found for mine was at www.tinyride.com
I thought of one more thing: the aria is bulkier when closed than the rally twin. The rally closes fairly compactly.