I have owned the new-style D4 for more than 7 years now, and here are some caveats:
The corduroy material gets pretty stiff after about a year or so. I have tried cleaning it to bring back the softness, but it's not coming back.
Now, when I use the D4, it doesn't get fully into the bottom of the grooves.
I have been looking for a decent-quality D3 ever since.
Ultimately, it works, but not as well as the older one!