I ordered a Duet on a lark from BB last week. It arrived Wednesday. I was fully prepared to return it the next day, as I expected unacceptably slow performance from the MediaTek processor. I was pleasantly surprised. Performance is acceptable and, inexplicably, it loads Gmail faster than any other device in my household. The screen is gorgeous, the speakers are acceptable (although I almost always use BT earbuds for portable devices), and the keyboard, while small, has a good feel. Battery life is incredible. Yesterday I ran it intermittently for 12.5 hours before giving up and going to bed. It reported that it still had a 30% charge and ~4 hours runtime left. This is the first laptop that I have ever used that doesn't induce battery anxiety.
I realize that this may be a minority opinion, but for me the fact that the Duet is not an Android device is a huge advantage. I spent a fair amount of time during setup ripping out lobotomized Android apps (Gmail, Google Photos, Google Play Music, YouTube, and more) and replacing them with their more functional web equivalents.
I can see no reason to buy the 64 Gb version, as the 128 Gb version is only $20 more. To my surprise, the Duet is a keeper.