Their website looks the same as cumulus one used to, have a quantum 200. I've had it about 8 years now (though it hasn't had heavy use). Has always seemed fine, although maybe a bit light on down (I have used it down to about the 0C recommended and it was just okay). Ive never noticed anything bad with the quality, maybe not quite as good as the PhD stuff I've got, but on par with mountain equipment sleeping bags (only other down bags I've used).
Yes, they were Cumulus.
I had a quantum 350 which I used between April and July on a walk over the British 3000' ers Did me fine. Slept a couple of nights in snow with clothes on as it was a bit chilly .
They do left and right zips which can be handy, and the zip was full length which meant it could serve as a duvet come July.