All the toolbars I've installed all have terrible search results powered by yahoo. I'm two months into using the Hawaiian airlines toolbar. It works for earning miles for purchase BUT usually I have to do two searches--one on the toolbar, and another in google just to find a reasonable search result. It becomes mind numbing with just one toolbar I can't imagine using 3.

Also if you think it is easy to generate tons of points by searching for random crazy stuff--it gets very very old very very quick. It is becoming really hard work for me to get 175 miles/mo from the HA toolbar. You'd divide that in 3 if you install 3 and use each 1/3 of the time.