The Meribel couloir to the left looked very icy when we did the GC and I wouldn't have fancied heading down it intentionally or otherwise - you could be sliding for a long time and there were some big rocks pointing out. Off to the right had much better cover.
The Meribel couloir is actually really nice but the top section is generally boney. You need to be a bit circumspect threading through the rocks before you get into the couloir proper which can be a beautiful ski. Indeed skiing it in fresh, very cold powder one January as the sun set behind Les Menuires is one of my most memorable skis anywhere.