Like them? No? Why? Let me hear your experiences.
I used them until I switched to the submerged drain method and I like that a lot better. Look for "ditched my durso" thread for more info.
I use them on my display and one of my sumps. They work great, only advice, make sure you increase the stand pipe size at least one pipe size greater than the bulkhead.
Ie - a 1" bulkhead should use at least a 1.25" standpipe with a 2" slip to prevent suction at the water surface.