I agree with Brent.
Most here should know I shy away from Kool-Aid flavors. I try to give fair play to all. Certainly, I've been vocal and opinionated regarding certain products and marketing hype.
RE the Legacy...I have a pre-production demo in service with my agency's fleet. AFAIK, it was among the very first in actual police service, certainly the first in the southeast region. It was provided for T&E and for a published product review. We quickly identified a design issue (I'll not get more specific) which resulted in an immediate fix to all bars and a minor change in the product. This issue would have certainly cost Whelen some dollars, as it was unexpected. They stepped up and fixed it, and we had our fix in hand in three weeks. Production bars all have the fix. Note, this is why quality manufacturers have solid reputations and are successful. It's also why they sometimes provide demo units. Quite simply, products need to be proven in the environment they are expected to be used in.
The Legacy is a substantial product for Whelen. It is the first real ground-up LED lightbar design for them; earlier products, like the Patriot, Liberty, and Freedom are all direct descendants of the Edge platform. What this means is that they designed the bar to work with the LED units in every way, from looks to thermal dynamics. It is thin because they designed the bar to fit the lighthead, not the lighthead to fit the bar. The entire bar is a major upgrade in construction, design, reliability and serviceability, IMO. Far easier to work on than a Liberty. I know, because we had it apart. I am not guessing here. The domes seal better than the Liberty/Edge's grove system...in fact, the only "trouble" I had with the bar was that the excellent sealing system makes sliding the covers back on a bit tedious. The endcap improvements are so significant that they are being carried over to the Liberty series. The internal wiring is not excessive or complicated. The lightheads mount in a logical and simple fashion.
I echo Brent's statement about wiring being necessary for features. Certainly it can be done other ways, like the ROC design which I have very little love for. I am very glad Whelen and others have chosen the modular, wired approach versus one big circuit board. Wiring provides flexibility, modularity and ease of connections.
Whelen has an excellent, next-generation lightbar in the Legacy. I strongly feel it will supplant the Liberty over the next five years, especially as pricing comes down. I think that Whelen will not be like others and won't be constantly releasing new lightbar chassis. I would argue they have only released this bar because it allows for a complete change to leverage current technology and their newest total in-house production capabilities. The Legacy is flexible enough to adjust to new LED technology in an efficient manner. The older Liberty design is pretty well maxed out, IMO. That does not mean it is not a good product, just that it has come close to it's design limitations.
RE SOS lightbars, I'm not sure what issues others are having, but I have had very few issues with the Pinnacle bars, which make up a majority of our fleet and nearly every lightbar I have sold and installed through my business in the last four years. Well over 100 units. I have replace one control board, three lightheads, two alley lights, and a few topcover encaps. That's it. The bars stay drier inside than any other bar I've ever seen. In all, most SOS products I've used/sold are very good to excellent. The Ghosts have been problematic and that has been discussed here.