I have played around with the Vero 4K+ for some weeks (upgraded from previous model Vero 4k). For me this device has been perfect in everything. Resolution adjusts according to source between 1080p and 2160p, the same for all framerates (including 23.976 and 24). I have not much material in 720p, 576i/480i), but would like it to be able to send that out in original resolution as well (it has been reported ;)). Output of DTS-HD.MA, TrueHD, Atmos and DTS:X works perfect (bitstream). Also with the new gigabit ethernet connection of the 4K+ all remuxed UHD blu-rays works fine as well, even without NFS (samba works fine) - I could finally throw away the annoying USB gigabit adapter used on previous model. Best of all; the much talked about bright blue light in front is gone. I use it most for blu-ray and UHD blu-ray remuxes. HDR autodetect seems to do the work in 99% of the cases; if you see banding on HDR material - and the automatic magic does not work in rare cases; just force it over to 10bit 4:4:4 and you are good.
I use the Vero 4K+ with Trinnov Altitude32 surround processor and LG OLED B7V OLED TV.
In short, no major issues - all small hardware limitations with previous model has been fixed with this one. Have not experienced any noticeable heat during heavy use either. So highly recommended.