The 535 is on my Do Not Buy list... About as bad as the Monster Turbine series, and the TripleFi 10 which has its own set of problems is a better choice in my opinion.
SE535 is way too out dated, you can probably get it much cheaper than $500. As a owner of SE535 I don't understand why people is still going after it. It had some mixed reviews when it was first released and there are many awesome choices in this pool.