I use my Nikon D750 for stills and short TL sequences only in order to not wear it out to fast. I prefer to use my old D90 for TL but it doesn't of course have Wifi. Has anybody used QDSLR with a D90 and third party adapter, and if so which one did you use?

The way to go would be the TPLink 3040. See: http://lrtimelapse.com/gear/dslrdashboard/

Thank you again Gunther, I had not seen that link on your site.