Seems a lot of trolls and people who may not really understand what they are talking about here (pretty sure I could solve any their issues with a Teamviewer session!). Very rarely do happy customers go and post to sites like review sites and forums anyway, and they are the unheard majority. Some comments here I see people simply need to learn how their SW and PC works. As far as customer support of Bitdefender is concerned I have no issue. As an IT professional I am familiar with pretty much every current antivirus product out there (though usually business editions) and I certainly trust Bitdefender to do it's job well. Every software has it's quirks, so if you don't like something then tell support, and they will welcome your constructive criticism, and help improve the product. Behaviour of some software on your PC may do some things in an unusual way that a security product may decide to block, such as the Bitdefender safe files feature.. but all you need to is configure it or temporarily turn off to allow a certain action. As IT pro I find 99% of issues is the PC hardware, some other software, driver or OS issue or the user him/herself.
I moved to Bitdefender after being a long time ESET user but lost trust after several business customers caught ransomeware on their servers with fully up to date ESET. Independent tests of Bitdefender over last 5 years are consistently good with low false positive so I decided switch to Bitdefender Security 2017, and now I have updated to Total Security 2018 and it is working very well. Security to me is paramount importance so I will use what I consider the best protection. The only other AV I might consider is Trend Micro who I did not like in the past but recent years have come a long way to improve.
Since this review was written Bitdefender has introduced a VPN as cheap add-on, though I don't use it because I use something else already, but a good addition.
So for me, thumbs up, highly recommend to protect your system.