Cue with my usual disclaimer - it's a very clever kludge that can work well, and may be your only decent option with a laptop, but can cause immense problems in some, if not many, situations. Personally, I've tried it. With one laptop it worked okay although it would freak out periodically and if I changed the latency, it would be okay for several minutes. With another one I'm surprised the laptop didn't catch on fire or something, it would crash with just about anything audio.
If it was banned software, I suspect the forum's "SONAR does weird things" posts would be reduced dramatically.
Cue pwalpwal saying that it's great and works wonderfully for him

. I'm sure it does (see my usual disclaimer above).