Don't get too excited, unless they're going to become a bit more reliable and customer friendly.
Having arranged to fly in twice one Saturday, I was informed after landing that they would be shutting earlier than arranged, but that for an enormous sum they would be prepared to stay open for my return flight!
The ban on single-engine fixed-wing aircraft is interesting. Before the airport got its licence and opened, I was told by one of the senior execs that the S/E restriction originated not from the CAA, but from the airport itself. That conversation is the only evidence I have of this. However, I expect the CAA will be involved in any moves to remove the restriction.
If you look at the airfield and its surroundings, and then compare it to other airfields, I find it difficult to believe that the S/E ban has anything to do with the airfield surroundings.
Incidently, the Sheffield ATIS has now gone silent, and the radio is just Air/Ground, callsign Sheffield Radio. Very sad to see any airfield under utilised.