Depends on the need. Having a Ferrari in the drive way is nice but not going to do you much good if you need to take some junk to the dump.
What I like about Epic/UE4 though has nothing to do with the engine and all about the “free” support. Trust me you can’t get far with out the support of the engine manufacture, since we are on the car thing, and it’s not uncommon for a software developer to “sell” you a service package above and beyond the up front costs.