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Mine came with a puncture repair kit in the stuffsack (and a 5 year warranty, the ultralight versions only have 2yrs IIRC). Of course finding a tiny hole to fix it when you're out in the hills might...

I have an older Downmat Lite 5, I'd probably go for one of the synthetic mats if I was replacing it now - mostly for the convenience of blowing it up by mouth without worrying about down getting damp.