They are better than KLH, IMO. For $50 new, in store, they cannot be beat. They use a driver array similar to KEF's Uni-Q array with a tweeter mounted in the middle of the 6.5 inch woofer. The speakers are surprisingly well built for their price, and offer some nice features. The anti-resonant enclosure, rubber surround for the woofer, and binding posts are all very nice features for a speaker in even the sub $200 range.
The speakers are not even comparable to KLH. They are not made by Best Buy, Insignia, or KLH, but rather a newer speaker company trying to get a start by selling their speakers to Best Buy. The name of the company that manufactures the NS-B2111 bookshelf speaker system is Radiient (yes I spelled it right). Radiient sells the same exact speaker in a surround package and offers the speaker with a top mounted tweeter including the one in the coaxial driver for $200 a pair. They aren't power hungry, but they don't scream either. They have decent bass responce and offer a surprising amount of soundstage in this price range.
Bottom Line: they are very good for the money, so if you don't have any good speakers or just need an extra pair for surrounds or for your bedroom, they will work very well.