Still don't think I have the headset quite centered though. And the FOV is pretty crappy. Looking directly at text is fine; nice and sharp. But text off to your left and right is blurry.
When I tried out the Lenovo at the Microsoft store I felt the FOV was ok but like you I was annoyed with the very small sweet spot that I could see thru clearly. But as I used it, and played a couple of games, I didn't notice the blurriness at all. These were fast action type games and I was worried that a game like Elite Dangerous, which isn't fast paced and won't cause you to look in a concentrated direction, would suffer from the blurriness.
Some say the Lenovo has a better FOV than the Acer and HP, others say it really isn't much different. Others on here also have said that the Samsung unit has a very small sweet spot but I felt it was very close to the Rift.