So far to date I have encountered two basic kinds of ceiling mount: 1) branded ones for a specific projector that are limited in the amount of horizontal and vertical adjustment. They are either priced reasonably, or ridiculously, depending on the vendor. 2) aftermarket universal mounts that are more flexible in their adjustments. However, some units don't work well with some projector's mounting sockets. Retail price is, quite often, also quite high. So, for those of you who have installed overhead front projectors, what do you love and hate about brackets? Has anyone got a specific recommendation for an aftermarket bracket brand that works like a charm? And finally, if you were desigining an aftermarket bracket, what features would you incorporate into the design?