Has anyone tried this little tool. It is supposed to give you a really smooth side and base. If anyone can give me a review, I'd really appreciate it. 
It works. Keeps the side of the cake perperndicular to the board. It is 4" high so on taller cakes, the top part of the side is not included - that is why I prefer to use the Smedger: http://globalsugarart.com/product.php?id=18998
The Smedger does the same thing as the tool in your picture and made by the same manufacturer. It is also longer (8") and can also be used as the regular fondant smoother for cake tops.
I guess you can see that I've been examining that site you gave me. I just order those cutters. Thanks again! 
Ok, one last question: Does the tool I posted also help to tuck the fondant under the cake? That's my biggest grip when doing cakes with out borders.
It doesn't help tuck the fondant under. There is a slight curve on the bottom so the tool doesn't really touch where the fondant touches the board.
If you are considering getting these edgers and the Stephen Benison scroll cutters, you might want to look at a cake decorating store from the U.K. to get them all together. I've done several times in the past to save. There are quite a few online stores listed at the back of cake magazines from the U.K. PM me if you want a list.
Forgot to say that I just use this plastic blade tool by PME to tuck it under: http://globalsugarart.com/product.php?id=19617
Just run it around the cake at the base to sort of nudge the cut edge of the fondant.
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