Ok...after a week, I can post a review of this one...
The Hans Rudolph Quest 6800 V2 is a new mask for HR. It fits between the 6600 V2 (a limited use thermoplastic mask like what you might find in a hospital for a short stay) and the 7700 V2 (full silicone and capable of being steam autoclaved).
The overall design is the same as the above two masks. It is a full face mask with chin support, akin to a 1/2 mask respirator instead of a "pocket mask." The Quest is made thermoplastic like the 6600, but made for longer use, like the 7700...and the price reflects this too.
Let's get the niggles out of the way first: this is a heavy mask. If you're used to something like an F&P Simplus or Quattro Air, this will seem like a very heavy mask.
The seal is robust, but you need to get the right size....if you don't, it'll leak significantly. They do have a sizing guide...use it. Typical sizing is 1-2 sizes smaller...great if you have a big face (i.e. someone else's XL barely fits), not as great for small faces.
Venting is noisier than many contemporary masks....this is old school with a single front port with less diffusing than other modern masks. Your bed partner may not like the blast of air or the noisier venting.
Pro's: This mask, other than a couple bands where the headgear attaches, is completely pliable material....pop out the bands and you can fold it up and stuff it in a pocket. If you side sleep, this means no hard frame pushing against your nose or face.
The mask is also pretty robust with the seal...once you have it fit, it is solid. It handled my "mask fit" pressure (~20 cm H2O) as easily as my normal range, with no bulging or flexing at all. If it weren't for the difference in the resistance to exhale, I would hardly have been able to tell when the "mask fit" was over and my "autostart" had kicked in.
Headgear is a bit more complex, but once figured, there are quick releases so you don't have to fiddle with it. It also has a tubing QR, so you can leave the mask on if you have to go to the bathroom at night.
Finally, as an "all over" sleeper, this one has been a winner. On the back, it's the same as any mask. On the side, it seems to handle side pressure not too bad with minimal leaks and no frame pressure. On the tummy, this one is a real winner...I've even been able to sleep face down between pillows (with care to not block the venting) without having hard contact marks on my face in the morning.
As with so many masks, YMMV....but if it works for you, it may be a real winner.