I use 2 Marineland C-series canisters. I've had both for almost a year now w/ no probs.
Everyone else seems to have good luck w/ Eheims. I've had 4 and none of them have been what you would call trouble free. I suppose I'm just unlucky.
Charlie
I reluctantly bought one from a friend because I needed one that weekend to set up a tank and there was no other option then getting the C-260 (220 - 240 whatever it is) for $50 (which ended up being a STEAL) or go to an lFS and pay over $150 for something.
IT WAS THE BEST FILTER BUY I HAVE EVER MADE
I COULDN"T BE HAPPIER. I will now go for these before anything else.
I have a buddy that got the big one and he said the flow was stronger then the XP4's, of course you can control the flow.
I think these are the STURDIEST filters around today, they are very thick and beefy.
Another plus is ALL BLACK parts for intake / outflow. They don't come with alot of good media (activated carbon and bio balls which I don't use) but you can usually pick them up on e-bay for pretty cheap.
I have never used Eheim's, I know those that love and live by them and then others that buy them to see what all the hype is and are very disappointed.
Anyone that went from XP's to Eheim's just don't like eheims and think the cost was not justified.
Those that go eheim, usually never go anything else.
I also LIKE MY FLUVAL'S very a whole bunch.
I hate my XP's, but they were so darn cheap (a year and half ago, they have since adjusted to market value)