I had a Fluval 305 that leaked within a year. I never did figure out where it was leaking, I tried everything I could think of and everything anyone else on several forums could think of and it never stopped leaking. I eventually replaced it with a Filstar. Having said that, I'd buy an 06 series Fluval filter if I needed one and the price was right. Hopefully they have solved the leaking issue, it was fairly widespread on the 05 series.
I haven't owned an Eheim filter, but I've watched people clean them and I have to say I would never buy a filter that I had to dig filthy media out of by hand. There are other zero-bypass filters that are much easier to clean.
As a side note, the Eheim classics and Fluval 06 series are different styles of canister filter. As the Eheim gets dirty, the water flow will decrease, while the Fluval will bypass water around the media and maintain most of its flow rate.
Wow, well that sure is a game changer lol looks like I'll be getting a Fluval 406 instead of the Eheim classic. Thank you for that info, I would have hated to get the filter only to find out I have to dig through dirt and slug to clean it out.
Lol I was in the same predicament a couple months back choosing between Eheim and Fluval. I got the Fluval for the same reason you are. I'll clean the tank and filter but the easier way possible for me lol.
You can actually get a 306 for your 55 and you'd still be alright with 303 GPH. Save a few dollars or so.