The d700 is working well for me. Suprised by the g.reat build quality. So quiet, and easy to adjust. Great space saving design. I have only one complaint, the skimmer cup is hard to remove.
I've noticed similar with my D500. It still makes me cuss it every time, but not nearly as badlyThe cup has gotten a good bit easier for me after taking it off about a half dozen times for cleaning. The first few times I thought I would never get it but now it is not bad at all.
I had the curve 5 for almost 3 years with no issues but have only had the D700 for a few months so I can't say much about its longevity. Honestly, I would say they are fairly similar with the D700 taking a slight edge on ease of adjustment.
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D500 for one year now, perfect. Hope this company continues to expand on equipment.