I can't give much advice on the longevity of the WM hinges, as I've only used their wood fuses, and make all my own wings and tail surfaces; and therefore do all the hinging myself.ButI've seen the "grey dust" from their metal hinges, and always been worried about whether the wear would cause enough slopfor there to bean issue with flutter. I call for Casey, and harass him constantly about this dust all over his control surfaces. It's all in fun, but these surfaces DO concern me with how much play they have,yet he's never had an issue. I remember seing a thread about thisissue quite awhile back. Read it and see what you think:
http://www.rcuniverse.com/forum/m_9123809/tm.htm

If you do replace the hinges, I personally have have better luck with Robart hinge points and the heavier duty pinned hinges, over the long haul . . . compared to CA hinges. If fact, Sullivan just had one of his aileronsfail at the last race. He said it caused a snap and that's what caused his "Panama Jack" P-47 to go in at the last race. He told me he's never using CA hinges again. The Robarts and pinned hinges add another benefit: More free-moving, with no resistance to control inputs. CA hinges always seem to be pretty stiff and resist being flexed. I'm no expert, but common sensewould make me suspect this makes your servos work harder, and therefore causes additional draw on your battery.