Well they come with the eclipse solenoid optomizer, and I'd gaurantee a derlin bolt and new internals. They are pretty much the same as a RAT only the RAT is a better value IMO.
Brisk, I just bought an Eclipse from epo. For the $$ your better off with a rat, nasty, etc...imo. Performance wise, if you were to shoot these markers - you would never be able to tell the difference.