I have a Beomaster 7000 in daily use. As I write this, I have no less than five B&O remotes on my desk, a BL1000, BL5000, BL7000, MCP5500 and a Beo4.
My thoughts / experiences on those:
BL1000: easy and reliable but feels a bit too simple with an advanced amp such as the BM7000. Mine is of the type where the track up/down -buttons are above the number keys (unlike my other BL1000 where they are on left and right side of the button "0") which is find annoying when flipping thrue tracks or radio presets (where I might need to adjust volume between tracks)
BL5000: fragile (only my second of these has enough working pixels on screen to make it readable! First one had only about five WORKING pixels!
) but so COOL as it's two-way. And I really like the round button -setup on the bottom, play/stop, track change, volume, all neatly there, easy to access with thumb. Has the CONTROL -function (fe. I sometimes first listen to a CD, then decide to switch to FM causing the CD to stay on in pause mode. With CONTROL the CD can be turned off without interrupting the radio.
BL7000: even more cool, especially with the floor-stand. When connected to mains shows the source, track and volume constantly (when playing, in stand-by it shows the clock) which is very nice. Very informative and easy to use. Hard to keep clean (fingerprints) and in-a-way slow to use, if it's in stand-by and you tap the bottom part it takes a second or two before you can actually control anything. The easiest remote to use if you want to program any timers. Also has the CONTROL -function. Will need a service to give it's best performance (remote range, battery life).
MCP5500: In my opinion the most practical remote control -design ever! Also two-way. Perfect control unit to keep on the desk. All buttons easily and neatly there and the round volume adjustment is very good (although it might need a small repair first to get it going. Also it's a bit too easy to scroll the volume to a very high level with only relatively small hand movement). Nicely laid out screen and even it has only a few icons they are used well, fe. the volume bar which also shows the fast forward/rewind animation. Looks really cool in dark! The screen stays lit only for about 7 seconds which I think it's too short time (perhaps a programming matter so not easy to alter?)
Beo4: Volume, track up/down, GO/STOP buttons nicely on the bottom easily accessible. I have always found it hard to get the MUTE on at the first attempt! Some source -buttons not available (in all versions) so they had to be added to the list: need more than one key to press to activate. NOT two-way so no status information. Setting sound adjustments is a bit tricky (Foxtrott, thanks for the tip about the SPEAKER command! That was a new one to me)
The two-way IS neat so I really recommend getting at least some of the two-way Beolinks if you have a two-way Beomaster.
BL1000 or Beo4 can be bought cheaply so having one of those is recommended. One-way remote for basic use, two-way remote for advanced use or for demonstrating to friends! 
Bang & Olufsen - The art of controlling sound, picture and light