The DM4's offer good musicality in an "old style" B&W design and should be a reasonable purchase if you're looking for bang for buck speakers. They can be bettered by today's speakers in a few ways you might consider important. Obviously, you should listen before you make a buying decision.
"What kind of ways would you say are important for newer speakers to better them?"
What ways are important to you? If you don't listen for what the new speakers can do that's better, it doesn't matter and I'm not much into laundry lists of attributes. How old are the DM4's now? Almost 30 years?
Why buy something you don't know anything about and can't hear before you make the purchase? That's hardly the way to go about putting together a top notch system for the least amount of money.
If you just want something that's "reputable", buy the DM4's. If you want something you know you'll like and won't be back here in six months asking about what's better, then buy something you can audition first before you buy.