Dan's Data has posted a review on the M4 Mini Monitors
If you want quality speakers on the cheap, it can be surprisingly easy to build your own. Various companies sell speaker kits that need little more than glue and a screwdriver to assemble, and the speakers you end up with often sound as good as far more expensive pre-built units.Read more
I've checked out just such a kit, from a company here in Australia that's inventively named The Loud Speaker Kit. Their M4 Mini Monitors are great little speakers, and the kit really is _very_ cheap.