I have a single Skyview that is driven by a Garmin GTN750 which is the same as the 650 except for screen size. My install is more than 2 yrs old.
No need to comment on the dynon databases. I do have the Seattle Avionics charts and IFR VFR maps. Those work well, especially for IFR. Those charts are backed up with Foreflight charting and mapping for redundancy.
The Garmin is a little more complicated because of $$$$.
A full house of databases thru either Jeppesen or Garmin would cost me in the neighgorhood $1200 a year.
I am using Jeppesen nav database east of the Mississippi. I do not pay for the approach plates for the garmin. I also do not stay current on SafeTaxi. You have that on Foreflight if you need taxi help. Terrain and obsticles do not change change much so I do not up date them either. You already have the terrain and obsticles on your EFIS thru Dynon. All for free so far, thru dynon. this approach for me brings my Garmin subscription down below $400 per year.and foreflight, of course for $99 per year.
I cannot comment on Garmins subscription, as I did the comparison some years ago.
You will enjoy the wonderful performance of the combination of your new garmin and the skyview autopilot. Full authority and performance on LPV RNAV approaches.