I happen to be the lucky owner of these monitors and as Rick mentioned I am using them in a nearfield setup. The Raal ribbon tweeter really is something special and IMO is in another league compared to the fountek ribbons. Don't get me wrong the fountek's are fine tweeters but the raal is pretty spectacular, it's crystal clear, and very smooth. The sb acoustics woofer has been a bit of a surprise to me, it's matches up with the raal quite well and doesn't have any trouble keeping pace. It's a quick little driver and considering the small size and sealed nature of the speaker it has plenty of kick and has good extension. I could see adding a small sub at some point but I wouldn't say that one is required.
This is my 2nd pair of speakers from Rick the 1st being the 3D that he showed at RMAF several years ago. Thanks Rick!