I bought myself a full set of Mission speakers about 10+ years ago, and I'm still using them today. I have a pair of mission 733s for my mains, 731s for my rears, a 73c for my center, and an SW76 sub (12" down firing, 150W amp). I had both woofers in the 733s replaced, at no charge to me, after the warranty was up, by Mission Canada. The plastic cones had started to dry out and crack.
Other than that, I have always loved the way these speakers sound, and I've never felt the need to upgrade them.