Personally I much prefer the action of Crank Brothers pedals.
I changed from SPD's years ago, because of painful knees and a dislike of the positive action required to actually unclip from Shimano pedals.
Crank Brothers pedals aren't as positive to clip into, granted, but to me that's a minor downside. They are much much much easier to get out of though (your foot literally just falls out when required, no positive movement needed) and they're much kinder on your knees, these upsides far outweighing the downsides for me…
Oh and yeah, they don't last as long. They do wear out quicker, or need a service more often. There's one simple solution to this… Don't buy the expensive ones, buy them for £15 (with cleats I might add!) off ebay from people that have bought new bikes that came with them (usually Candy C's, IMO the best pedal they do, Smarty's are piss poor by comparison) but use other pedals, so sell them on ebay… I've bought my last 3 pairs of pedals (all still going strong, 3 different bikes) this way and it's a highly viable option.
The only time I wish I was ever on Shimano pedals is when it comes to having a go on other people's bikes, as most still run Shimano!
Oh, should just add… DO NOT buy eggbeaters… Buy Candys, Mallets, Acids (not Smarty's, they fall apart in a couple of rides and aren't rebuildable), but eggbeaters are very difficult to find when you need to clip in, and they're only about 50g lighter than the equivalent Candys (and even the Candy C's are lighter than top end Shimano XTR pedals)…