I love them. I've never had a problem with any of their gear personally that would warrant using the warranty process, but a couple of my friends have used it (US, though, not Canada) and had a good experience.

Everything I have has held up super well. Plus Patagonia holds its value pretty well; if you no longer need something or your size changes it's generally easy to resell, and if you don't want the hassle, you can still get pretty decent credit for it just doing Worn Wear.