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Re: WALK and SuperPro:Apparently, SuperPro used to manufacture the bushes for the WALK - They no longer do. Also, the poly used by both companies is very similar. The cases of WALK insert failure (as Tsi_Mike's example) is about 1 in 500 and, of those, much more commonly in cars driven very hard or on track.
IF anyone experiences WALK bush failure, then the most economic solution (I don't know what WALK's warranty is like) is to buy the appropriate SuperPro bushes which will fit into your OEM consoles (of course you did keep them, didn't you!) and you won't lose any WALK features, so I'm told.
Here are some of Tsi_Mike's example pics: