I have a 6 way in my demo and it sh#ts me. oil leaks out of the high speed compretion damping, i had it fix and it was great for a few mounths then it started leaking again.$200 a time. I will never buy manitou again.
I could go with the obligatory "Gravedig" comment but I think this topic is still kind of relevant. A lot of people still use this type of shock, so I will suggest a few simple tricks to keep you out of trouble.
Firstly, I find that most problems people have with the Swinger/5th element series stem from innapropriate SPV pressure. Although The minimum is 50 PSI (5th) and 75 PSI (swinger) you really should use about 10-15 psi above the minimum, as there is a good chance a little pressure will escape when unscrewing your pump.
Secondly, the adjuster screws on the 6-way series are BLOODY touchy. They strip out really easy, and seem so dang fragile. Be super carefull when adjusting them, and when you feel them reach the end of their travel (the compression screw that is) its best to back the screw off about 1/2 a turn just to be safe (if the setting you want is either full on/full off).
Thirdly, everyone should check out the Manitou site, and learn how to rebuild their swingers/5ths. Its really pretty simple, will save you a hell of a lot of dosh, and you won't be without your shock for very long, as you won't need to send it off. If you're not confident about doing this, I suggest having a crack at it anyway, as you can always send the shock off to a service centre in little peices if you can't refill it properly (provided you haven't dfamaged anything in the process)