I just got my new Euro RC-500. I was a beta tester and had some problems and Jeff worked with me to get this new skimmer.
The 500 now comes with 3 Eheims instead of the 2 sp4s. The build quality is much improved. The twist flange works perfect, it has a new reinforced joint to hold the drain assembly. It is just breaking in now but it looks great. The bubbles seem smaller and it is pulling a ton of air. Time will tell how it skims and I will post some pics later, but I have to say this is a big leap forward. I can't tell you how easy Jeff was to deal with and he spent a lot of time helping me. I think any customer service problems are a ting of the past. I was leanig toward a German skimmer for my next purchase as I love the Eheim pumps. I think this puts ER on an even playing field. Time will tell.