I'm in the market (casually-my Dominators are stinky and sad looking but intact) for new shoes and I like the Specialized road models I bought a year or so ago. Thinking I might try a pair of their mtb shoes. The ones I'm looking at have the new Boa closure at the top--are folks finding this system pretty reliable? If it fails, are the lower two velcro straps sufficient to pedal-limp out of the woods? It has a lifetime warranty but I'm more concerned about getting stuck 10 miles from the trailhead than replacement cost...