Les: I tried parallels and vm fusion 10 for windows 10 but my macbook pro 13 (2014) is really not up to it. Parallels was terrible and neither program would properly handle a Yosemite VM. Fusion did pretty well on Windows 10 but it was slow and clumsy. Virtual box is probably not suited to my skill level.
Vyger: I did try Windows 10 on fusion but will wait for the native mac version of RM. It's only been over 6 years but who is counting. I am using FTM 2017 happily but my spouse is trapped in RM7 with a huge database. She was OK under Yosemite but tech support encouraged her to migrate to Sierra where they knew retina macs (most mac users) had problems they did not plan to fix.
I use RM7 under “full” - paid for - CrossOver and have had little trouble over the years moving up through the various MacOS versions including the latest version of High Sierra on a Retina 5K iMac. I have also used RM for Mac but there is a little more flexibility with full CrossOver - I changed the DPI setting in “Windows” (i.e CrossOver) and found some fonts that are OK (though admittedly could be a little clearer) and one gets the more recent updates to CrossOver.
I make very heavy use of Family Search and in general it works very well despite my slow internet speeds and I can usually keep going for hours and often even continue the next day without restarting RM or logging out and then in again using Family Search Central. Yes, from time to time I have to Force Quit RM, one assumes because the FS connection has died or gone away, but the overheads are far lower than when I used to use Parallels and the complications of keeping full Windows going, so any minor pain is worthwhile in comparison.
I find the combination of RM and full CrossOver very usable, though not perfect. Some others seem to have had more trouble, though this would seem to be more prevalent with the cut-down CrossOver included with RM for Mac. OR is it that I am in the UK, so probably using FS mainly only up to about 1300 EST, so not exactly peak time in the US, and Family Search will therefore be under less stress.