Me and a friend just ordered quite a few Rena XP3s and they weren't as great as I have read. I noticed immediately that they felt kind of flimsy. Of course I'm comparing them to my FX5. I don't feel terribly comfortable with a piece of equipment that could drain my entire tank out being made from thin plastic. Just as I was typing this I received a call from my friend who purchased 2 of the same filter. He has a problem with one of them and it's leaking all over his house. He has been working on it for a few hours with no luck. I have read tons of posts where people recommend this filter. I honestly couldn't recommend this over the FX5. For a few dollars more on the FX5 you get a differen't class of filter. I would rather use the same money and purchase 2 AC110s. Atleast the AC110s wouldn't be able to cause thousands of dollars worth of damage like the rena canisters can. Just my 2 cents.
