I have been using a R2E since January 2009 and I am rather happy with it.
For the price I payed it, the quality of some hardware parts is poor, like cpu socket, PCIe and memory connectors.

The BIOS is upgraded rarely and till today they don't unlock the memory pages to program some memory latencies under Windows, using programs like CPU-Tweaker.

The high priced OC Station is in an alpha stage of development and it lacks a lot of very useful features, like the auto loading at start up of a programmed profile, display and setup of memory latencies, programmable date and time display in some most used international ways (like dd/mm/YYYY hh.mm that is used in Europe), localization in the classic 5 most used languages (English, Spanish, French, German, Italian), etc.