Great shoe!  I bought these in 2008 and still wear them every winter.

Pros:
> Comfortable.  I feel like I'm wearing slippers.
> Good tread/grip.  I've worn them countless times in the rain and in the snow and haven't slipped yet.
> Adjustable strap.  I have a pair of Blitzen Polar Crocs as well but I love having the adjustable strap on these to enable a tighter fit, especially when I'm active in them.
> Durable material.  Other than the fleece liner (more on that), the shoe still looks great considering I wear these more than any other winter shoe in my closet.

Cons:
>  Fleece liner.  It doesn't look very good for very long and it's not easy to remove/replace after washing.  Crocs sells replacement liners now which is great (though somewhat expensive in my opinion).  I'll probably order a black liner replacement (as opposed to the oatmeal color I had before) and hopefully that will look better for a longer period.  I'd prefer the liner just snapped onto the shoe, rather than having to thread the rivet.  It's a huge pain.

Note:  I've seen the recommendation to buy one size larger then you'd normally wear and I did this when I bought mine.  They did fit well at first, but a) I thought the shoes looked huge on my feet and b) after the liner flattened out with continuous wear the shoes were actually a bit big on me.  I don't think you can go wrong with buying the larger size, but I may try going with my actual size next time, knowing they will be pretty tight at first but should fit better after being broken in a bit.