Very basically, you have three two element beams that you don't need a rotor to turn. That's sort of a nice thought right there! Considering how 'sharp' the average two or three element beam's radiation pattern is, it will cover just as much of the 360 degrees as they would, with only a very slight degradation (if any) in 'point-ability'. Personally, I don't think you'd ever realize the difference. It's omnidirectional ablilities ought to be comparable to any other 1/2 wave vertical antenna.
The down side.
Those relays for one thing, and the required control line. Relays have limits. Those limits can get quite large, but so do the relays and their cost. Still cheaper than a mid-sized rotor, so not all bad. I've only seen two locally and they were sort of marginal for local winds at times (tornado country). And because they aren't exactly dirt-common, the price gets sort of ridiculous at times too.
I'd like to have one, or several for different bands (don't hold your breath though). It can also be thought of as a phased array, which can be kind of handy. And like any antenna, size is frequency related, so I don't think I'll see many of those three element phased arrays on many vehicles for CB use. Oh well, whatever.
- 'Doc