Straw poll: Winter ales?

A quick question for all readers (and writers) of this blog: what winter ales would you recommend? (Any thoughts on what defines a winter ale also welcome.)

Have you ever tried any of the following seasonal beers from some of my favourite breweries?

• Box Steam, Xmas Dark Box
• Cairngorm, Howler
• Orkney, Clootie Dumpling
• Ringwood, XXXX Porter
• Vale, Hadda's Winter Solstice