Fresh from my first trip to the T1 arrivals lounge this am...
It feels smaller than the T4 one but everything is there, showers, MB spa, smoking room... showers are the same Hans Grohe Pharoh 's as per T4

and the GF reports that the massage from the spa is just right..
Didn't feel as much as a trek as I thought it would but certainly isn't as convenient as T4, still we can't have it all.
No problems getting in on an MFU ticket and, most important, all the staff were happy and friendly.. no lounge dragons spotted.
Enjoy