Not tried it yet, I am also waiting for some feedback, but am booked in January.
It's about a £10 taxi fare from the train station to Aether.
If you are coming from somewhere local it might either be better to get a car directly there, or to pick up a cab from a tram\rail stop before Manchester Airport.

I saw the Aether lounge all lit up the other day when I landed at MAN. You go past and it's on the left just before the General Aviation hanger.
There didn't look to be anyone in it.

I think it's going to be more or less the same as it was previously when it was running under another name before lockdown, but perhaps with better food.
So reviews for that previous service are probably still valid to set expectations.

The red circle is where the actual lounge is. Google maps puts the location where the brown circle is which isn't right. Basically you drive to the Runway Visitor Park and turn left just before it.