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I'm amazed at how well these things work.  They're a little stiff at first, but they loosen up with use.  Also, I find that TPFE lubricant like Labelle #134 works wonders.  I have a chain ready with end mounts to install on my y carriage, and I'm trying to figure out a way to handle the x axis. 

I am also thinking of using them for my Z axis - not because there is any particular need - I just think it looks cool.