Took me a while to find the advantages of this tool, but once I started experimenting it made a lot more sense.
I created a searchroll for book shopping and added all my favourite online bookstores. I could use this regularly in the library for finding particular books to buy, using only approved suppliers.
I am finding the site a quite unreliable in that it usually takes two or three attempts to actually connect. Have not had this with any of the other web 2 applications.