I just installed Developer Beta 4 of High Sierra on my Beta Drive. The install was fine. I am testing my main go-to Apps in there right now, all seems to be well. It is quite snappy. Apple has included some of the Desktop background pictures from the new iMac Pro, they are very cool. Hopefully, when 10.13.4 is released it will include all the fixes that Apple has released in the past couple of months.