I love marble rolling pins. Their heavy weight does some of the work for you. You can find cheap ones for $15 or less.
I use a Sil-pin. I've got a really heavy one with metal handles, and then I've got a long skinny one that I use most often.
I've had marble rolling pins in the past but the darn handles break off after a while.
Yes, I have been decorating for about 9 years now and have gone thru 3 of them so far. Once the bow it's hard to roll the fondant even. I finally found a 24" fondant rolling pin called the King. It's bigger around and hasn't bowed......yet 
I really like using it. They have some cool ideas on their site. Here's a link if you want to check them out.
I have had mine for years and it's still fine. Before that I bought an 18" long piece of 2" wooden dowel from a hardware, scrubbed it and seasoned it with shortening. It works very well, I still have it. I also like the marble ones but have never seen a long one. I would get it if it exists.
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