I have a pair of BM5A's aswell and I like them alot. I had Mackie HR626 monitors which were also very nice. I like both the Dynaudio and Mackie tone. The Mackies have that a little harsh or crisp sound but I somehow liked it too. At least with Mackies I could say more quickly if something was wrong in the mix or not. With Dynaudios I have to listen more carefully or at least totally differently because the BM5A's tend to produce great sound with about any material. But yeah, if the audio is well mixed the sound is just superb. So if you want to mix a good mix with Dynaudios you have to tweak till it sounds superb I guess.
These little things play pretty loud too and the bass response sometimes surprises too. I extended the bass ports on the back by 4.5 centimeters to get a more like BM6A tuning and the bass plays a little lower now. However I will add a subwoofer to the system in 2 weeks to get that missing bottom end.