Had an Aokatec AK-G1s receiver for my D800e. It worked well, but as the reviews noted when it came out in 2012?, it was prone to detach itself from the 10-pin connector. I found it the first three times it fell off; I didn't the fourth time. Are there any better units now available? I found the Solmetma GeoTagger 3 and the Dawn Eco ProFessional2 on the web, but it isn't clear they are any better, and they are noticeably more $. The Nikon unit, from what I've read, is way overpriced and eats batteries. Thanks.