I used to own some DM 600 series that sounded great, both bookshelf, one Kevlar, one pre-Kevlar. That was also back in the mid to late 90's when I used to sell them, along with the matrix series etc. I was also present when some of the nautilus line was introduced.
I think overall they provided a lot of detail and refinement but were difficult to enjoy without good amplifier matching, especially nautilus. I never listened to the 801 models of either series which are historically amazing. We sold snell at the time which I would describe as a speaker that would not image and stage as well generally, but would move air more freely and play louder without sounding horrid and usually for half the price of B&W. A poor amp choice and loud volume made some of the B&W line made you want kill yourself.
I remember reading over the matrix 801 stereophile review about how incredible these were but there was a caution about shooting themselves in the foot if they were released to dealers who didn't use the right equipment with them. Easy to do because at the time they were $5k, and it would be easy to drop them into a midfi dealer who didn't carry the best amplifiers for them. That was an eye opener because my shop was always trying to make Adcom work for any of the Matrix/nautilus line and they surely did not.
I guess to sum it up, they are all built to please and seem uncompromising when it comes to the finer details that focus in on recordings. However, the price is revealing the unmusical characteristics of the associated equipment and are unforgiving.
For me, due to budget issues, I tend to lean slightly more towards forgiving speakers that fall more into subtraction when it comes to frequency response issues. Plus I like to feel the music sometimes, rather then just concentrate on a painted picture. I don't know all the rest of the gear you use but I'm guessing you have access to to really top- notch products so you might find something really amazing in B&W. Nice resell if you dont.
Joe