You weren't very clear on how the helmet works. Does it simply project this perfect world onto your mind, like most of the responses so far have assumed, or actually give you the ability to create and control your own world?
If the former, than fuck no. A perceived reality could certainly be impressed upon the mind enough to eventually completely deceive it, but I would not accept the offer knowing it would all be a lie. My loved ones would not be experiencing this world with me, as they would be dead.
If the latter,however, and I could create a whole new world and control it completely, than I would accept in a heartbeat. In my perfect world, all of my loved ones would be instantly brought back to life should the aforementioned scenario scenario occur, thus rendering the consequences moot. All that other stuff about being able to control the fabric of reality would just be a bonus.