I have my Monitor 5b's set up in my 2 channel room and have them hooked to my Marantz 2252B receiver, and have been doing some comparisons between my tube rig and my LSI m 703's.
While the 703's are a real treat to listen to, smooth and refined never sounding out of place or struggling to reproduce the right tone I gotta say that the 5B's in combination with the old school smoothness of the Marantz, really sound fine. The 703's bass has way more depth and refinement as you would expect, but given the age and technology of the 80's i am a little stunned about how easy they are to listen to and can say they are not junk compared to the 703's.
Hell I have even played them all at the same time and they don't clash at all. I kinda expected that the 5B's would not hold up, but they do... I really like having a retro rig to listen to... I always loved the way 70's and 80's rock sounded on them, but never had anything quite like the Marantz to drive them with.
Next up.... I think I'll hook my VR3 LSi 9's to the Yammy M80 for spits and giggles and see how they sound in comparison in the room.