That db coax monitor looks really similar to my RCFs. I'll be curious to hear what people say about it. As far as what RCF offers vs QSC and others, it just sounds good. The sound is unhyped and I get the impression that I'm hearing what the Axe and my guitar are putting out. I don't eq anything to compensate for it. The biggest thing for me is that I never think, "oh, if I had xyz hooked up then it would sound that much better" which I did with all the other solutions I tried (RCF 310a, Mackie SRM450-originals by RCF, Power Engine 60s, Peavey Classic 120 amp into various cabs). I'm too caught up in "what flavor of awesomeness do I want today?".
I'm still working at how to get that awesomeness projecting properly in smaller venues, but when the RCFs are pointed at my head, my tone options bliss me out in a way I've never experienced and they do it at fairly quiet volume levels and at levels that deafen me. I'm sure there are even better sounding options for crazy $ and maybe for similar $ if the various makers with FRFR in development get their stuff out. For me though, the combination of fantastic sound with amazingly compact size and weight have me happy for the first time in my Axe life with my FRFR.
Before the RCF I would periodically and sometimes often get the feeling that I was living with my FRFR solutions until something really great came along that would bring out the greatness of the Axe. For me the RCF is that great thing and if other things come along, fine, I always have my ears open, but they're going to have to be pretty amazing to get me to give up my RCFs.
If the dbs are 80-90% of the RCFs, they'll be a welcome solution to many I bet. The overall form factor looks almost identical.