Greetings: RealBand shines at many things which no other "DAW" can replicate. I own and use Sonar, Ableton, Sibelius, Finale; but RealBand is the tool I prefer to quickly generate quality tracks. No other "DAW" on the market can accept a set of chord changes, and instantly generate production quality instrument parts.
Granted, RealBand UI is a bit funky, sometimes frustrating, and it is fairly new compared to older DAWs. Still I have found it very worth learning, and now prefer RB in some situations. I agree, there are some areas where RB needs vast improvements - i.e. VST, Latency, Synch, and Rewire support are areas where you may need other DAWs. It really depends on your end goal... Also, the folks on this forum are extremely helpful when you hit a snag, and that is a huge plus...