I used this for a while but I found that it was unbearably slow. Perhaps it's too much to ask from a RaspberryPi3.
An Rpi3, even a Rpi B or zero is plenty good enough for DNS queries! The Admin interface has been a bit of a bugbear for a while, but we are working on some massive improvements for the 3.0 release (coming soon™)
Also I was really concerned by the fact that anyone on the network could access history for everyone else. It's not a nice feature.
It's a good project otherwise, props to you guys.