I have Burton speedlaces on my last three pair of boots (2009 Serows, 2011 Driver X, and now 2010 Driver X).
I have about 75 days on my current pair and have no issues with the lacing system. Love it. I do the lower zone up a little loose and the uppers fairly tight. I like that if I need a mid-day adjustment I can usually do it without even removing my front foot from the binding.