I just got the 305 and I love it!! I only have two problems though. Mine makes like a humming noise louder than I thought it would even when I took it all apart and put it back together. But that's not that big of a deal. And when you push the aqua stop valve down and take the hose off the canister, it goes like BOOM and water squirts out. But you just need a towel for that. And, it takes a lot of pumps to get that thing primed, your arms will be ripped by the time your done.
Buy overall, it's a good filter so far, it comes with media, and I would highly recommend it! Fluval makes good stuff.