-Just found this thread, and thought I'd chime in with my experiences with Monitor Audio.
Short version: I'm very pleased with their performance!
Long version: I've previously owned MA Studio 20, which I used with various amps over the years in stereo configuration; tube amps before I finally sold the speakers.
My experience with the Studio 20 was so positive that I decided to go with MA the next time as well. But this time in a 5.0 system (subwoofer from other manufacturer, see below). Since I didn't have the dough this time (well, I didn't before either - the Studio 20s I had were on sale as B-stock), I went for the Silver series: Silver S8 fronts, SLCR center, and Silver S1 in the back.
For a subwoofer, I went with SVS PB12-Plus/2. You'd think this is a bad combo, what with the 'English' sound of the MAs - but it all integrates beautifully! It just sounds like I have very large front speakers.
I'm very happy with the system's performance, both in stereo and in surround. I'm using an Arcam AVR300 receiver and Tara Labs RSC Reference speaker cables for the fronts.
The only thing I'm not 100% happy with to be honest, is the SLCR center speaker.
It just sounds a bit 'hollow' at times, and has a different sound characteristic than the fronts, something that surprised me a bit since they're in the same series.
So anyway - all in all, I am and have been very happy with Monitor Audio speakers. Both in frequency range, stereo image, musicality, and even punch and share force when it comes to movies.
But they took some time to "burn in" - expect them to sound their best quite some time after you buy them, unless you buy them second hand.