I have their 65 "HDR" TV (older model?). It not really an HDR TV. The whole 10 bit panel with wide color gamut is just a marketing gimmick and not true. It does not accept HDR signals and only accepts normal 8-bit signals. I had a long conversation with their customer support over mail for the same where they tried to put a spin every which way to support their claims, sometimes even contradicting what they said in previous instance, including a blast from the past saying its "HDR ready" TV. They could not explain what "HDR ready" means.
What I realised is as a brand, Vu is not trustworthy and I will never buy from them in the future. Its ok to buy entry level TV sets from them but for higher level ones, I would suggest going for Samsung or LG. You might get a slightly smaller sized panel for the money but they are more reputed and reliable and more honest with their claims.
I have been meaning to write about this whole cheating and false advertising by Vu for a while but could not get time to do so. Seeing your post made me to warn you about not taking their claims at face value and make a mistake like me.