I have two Quintum DX gateways. I upgraded one of them from P101-14-00 to P102-11-00 on Friday.
No problems so far. I noticed some instability (socket errors etc.) in the previous version, but so far, the alarm log is clean with the new version. I will leave it a week or so before making a final judgement and upgraded the second gateway.
Two new features (which are long overdue) are secondary clocking source and T.38 with fallback to G.711 for fax (which works).