I used to use Hero Engine for my MMO project and I was beyond satisfied. The real time editing was amazing. Not having to wait for a new build to compile is priceless. One thing I noticed you didn't mention, was all the included licenses you get with HE. The list is quite impressive after factoring in the cost for each individual license. If you are making an MMO I highly recommend HE. If you are making something smaller, say 2D RPG, then stick to Unity or another engine.