Stealth heads vs Eddy performer rpm

So I've used RPMs and Indy, and Bremeric has used Stealths and RPMs. What have you used other than a bitter keyboard?
If someone considered them ready to run literally out of the box and you don't exceed the recommended performance envelope with them, then they will be cheaper than the RPMs out of the box by I think $800 IIRC(something like $900ish vs. $1800ish?). If you're like me, and believe "out of the box" can be improved and want to take that step, then the Stealths will end up being about $300 less than similarly prepped RPMs.