I have a couple of (now more or less former) clients that have started using it and I would say the quality is a tad under Lumion 8. On the other hand it is a realtime viewer/window inside Revit, so no export or special knowledge needed. The learning curve is close to zero. From what I can tell it is taking the architecture world (those using Revit) by storm and I've noticed a significant drop in work from these Enscape users. One of the latest versions added a very decent lawn that replaces all surfaces that are defined as lawn in Revit with a pretty decent lawn shader.
It doesn't help those firms still using AutoCAD, and final presentations and marketing material still needs more than Enscape, mostly because you wouldn't populate and accessorize a Revit model the way you do in Max, but it will likely have impact on your less complicated renders, I know it has had for me.