I've got an LSR in my 450R and an RPM in my 400EX. Both are doing well.
My Lonestar was much less expensive than the RPM. Both seem to be quality axles.
Stay away from Durablue - had them in the past - seen far too many broken ones that should not have broken.
Their "Lifetime" warranty is good for your first broken one - after that, you're on your own. One guy I knew got one day's ride on his original, and one day's ride on his replacement.