I think this argument has been done and dusted already but I really find it hard to get excited about Maxwell for architecture.
Putting aside the renders done by Keytoon, I haven't seen anything that couldn't and hasn't been done much quicker with other render engines.
The point there is that I'd imagine someone that talented could have produced those images using anything.
I've seen great stuff done by people like Zuliban and Otacon in Maxwell but the work they have done using other software is just as good.
The quality of Maxwell's output is obviously good but it's not nearly as revolutionary as we're made to believe in my opinion. The ease of setup could be a big bonus but, as said (at length ) above by Ian, it is also quite restricting.