I like them--but I haven't used them a load yet. They definitely have some pros and cons though. They're easy to set up (built in angle) and give very consistent ink coverage.
They do lack some of the adjustments of standard squeegees, and will not do very well if you have poor OC or head linear calibration. They're a serious pain to clean between the extrusion and tip as well.
The Hydra floodbar is pretty handy sometimes, but it takes up a lot of room on the screen--we have to burn stuff a couple inches lower than where we'd put a design with a standard flood. It really fills the stencil with ink though.