I figure I'd post here rather than starting a new thread since I'm also considering switching from LOOK to Shimano.
I'm on circa 2003 Look PP-396, so no matter what I'll save weight on my new build with either Keo Blade or Keo Max or Shimano 9000 or 9100. What I do like about my old pedals is the sk- binding-like feel one gets when clicking in. There's no question: when you're in you're IN. I use red cleats which have 9 degrees of float. A lot has happened since 2003 though and I don't know if the new LOOKs will have that same ski binding feel. At 85-90kg / 195 lbs and 47 or 48 cycling shoe, I'd like a bigger platform than the smallish looking Keo Blade 2. I only hear good things about Shimano... so maybe it's just my nostalgia that's causing me to still consider LOOKs?
I know @Calnago prefers Shimano and @Cyclespeed also casts a vote in. Also grateful to @TheDarkInstall for the summary below.
-Time / Mavic. Utter, utter, utter shite. Avoid.
-Look. Bearings develop play in them very quickly. Stiff bearings out of the box. Cleats are mushy when you clip in. Carbon blade thing is a gimmick that breaks.
-Shimano. The absolute best. I am still on Dura Ace 7900, and have given them hell over the course of 5 years. Bearings are still totally perfect (and excellently engineered), and the clip in is still as positive and loud as it was on day one. Cleats available everywhere, really nice wide base, etc. They are the ultimate.
Speedplay. Pedal body seems alright, but the cleat system is an over-complex, over-engineered joke, that needs lubing, and a large rubber thing attaching to it so you don't grind the metal body into the floor every time you get off the bike. Compare this to Shimano cleats...