Hi Lee,
unifiber stuff seems ok.
I have a 400 C60 Unifiber RDM that i got from caloundra wind and surf and use on my smaller KA sails. i haven't had any problems with it so far. had it about 6 months and used it a few times now. it feels nice and solid and finish is good. it rigs well on my sails too.
it was also an amazing price so i couldn't say no.

i haven't had it long enough for a real informed opinion. ie. some of my powerex masts i've had for 5-6 years and still going strong.
fingers crossed and no problems to date.