This is a little late, but I thought I'd share for future readers.
From a solar imaging standpoint, the DMK 51 has been the "ultimate" for years on the Lunt 60. That's all fine and dandy, but they are "old school" from a USB and speed perspective. Add to that the fact that they are no longer available, having "teamed" up with the Skyris brand of cams marketed by Celestron.
When I started looking for another solar cam, several hours of research revealed that the 174MM compared almost exactly with the DMK 51 in terms of resolution, pixel size, etc. The CMOS uses a "global shutter", making it as "quick" as a CCD.
I've had one for about three months of daily use (I live in a desert... plenty of sunshine), and couldn't be happier. The details thru the Lunt 60 are extraordinary.
I've had to add a Peltier cooler to deal with temps in the desert that reach 117 degrees (F) during the summer months, but that's not ZWO's fault.
I strongly recommend at least comparing the 174MM to all the other solar cams on the market. I think you'll agree.