Well folks, after what 4 years, I’m finally upgrading our master bedroom TV with a new Vizio 55” M Series Quantum (4K of course) It replaces our 2015 model Vizio 50” M-Series (4K but no HDR or Dolby Vision). The 50” will be wall mounted in our den which could prove useful for movie viewing while I’m working on film scanning or for a big screen setup when I hopefully become eligible to work at home. Originally I wanted the 2018 model Vizio P55-F1 but those are getting really hard to come by. Vizio lists them as not available but notify me when they do come available. All the reputable outlets list them as out of stock which leaves only eBay and Amazon third party resellers advertising “open box specials” or “factory refurbished” with skimpy discounts. Don’t trust either one. Wife informed me that the new M55 has arrived (sent pictures) and awaiting me to come home to install it (A couple of carpenter friends of ours who know how to do wall mounts will wall mount the old 50 for us before I get home). As for the M55 Quantum, note that there are two, no now make that three distinct versions of the M55 Quantum’s. The one I got, the M558-G1 features 600 NITS brightness and 90 local dimming zones. The M557 and now the M556 have 400 NITS brightness and 16 or 10 Local dimming zones respectively (wonder what’s with that). Checking over the specs, the new M558-G1 Quantum seems superior to the 2018 P55-F1 in most aspects, save for native refresh rate (120Hz for the P55 vs 60Hz for the M55, not sure what to make of that effective refresh rate) and maybe brightness. Any of the M55 Quantums or P55 will be vastly superior to my old M50 so I think I’ll be quite happy. In my MBR setup, the TV is pretty much the hub. I do have a Vizio 5.1 36” sound bar setup on this but someday I’d like to bring in my old Denon X2000 AVR but by that time, I might just be able to get a much more up to date Denon AVR X2600 or so quite inexpensively. This setup does also include a Sony 2100 Blu-ray player, a Sony 510 DVD player and of course the cable box. Might add a Roku Ultra 4K and ATV4K (Spectrum has a deal in those). I’ll be updating this thread with my observations on how this set performs.