Jailhouse Blues impressions:First of all, thank you, khaangaaroo, for the opportunity to play with this super cool keyboard!!!
The keyboard itself was quite a surprise! The short key travel distance really makes the switches feel differently from other MX Switches I've tried. It's almost like having a stack of o-rings on every key, but of course, different, because the tactile bump is very close to the top. I thought it would be more like a rubber dome keyboard in a way, because the the tactile bump being higher up, but... it's not. It's tougher and snappier than rubber domes but has a thicker and heavier feel than clean, crisp, and lighter normal MX Blues. The sound from the keyboard is dampened, and some switches still make a faint clicking sound--many don't. The hint of a click is there with most keys when typing.
When I first tried the switches, after unpacking and plugging in the keyboard, it felt like the keys were fighting my fingers. The travel distance was short, and the rebound was quick (springs are at higher tension, because they are slightly compressed), and I felt like my hands were getting a workout--like hitting a light punching bag made for fingers. But, as it happens, I got used to that sensation, though I still think that slightly lighter springs would be beneficial for me personally.
These are not like MX Clears. The toughness is maybe similar, but imagine Clears with a very quick snappy bump close to the top of the travel and also a couple of o-rings. That would maybe be Jailhouse Blues on these keyboard.
My Panasonic camera mounted ~20 cm away from the keyboard:
It's almost impossible to not bottom out or be close to bottoming out, because the force required to overcome the bump + short travel distance make it difficult to stop. For the video above, I typed slower and tried to avoid bottoming out. The keycaps are made of thin PBT, and the sound overall is muted, thumpy, and not terribly quiet. I can type more quietly on MX Browns by softly touch-typing, but the sound signature is quite different anyway. But the difference in feel between MX Browns and Jailhouse Blues is immense. My main 2 keyboards have MX Browns, and typing on Browns feels like typing on buttered switches after Jailhouse Blues--much less of a workout from lighter actuation and longer travel distance.
For reference, here is MX Browns (on a Filco, caps are from Ducky Shine) vs Jailhouse Blues (QFR). You can see how muted Jailhouse Blues sound--and I actually have very thin silicone o-rings on that Filco. Camera mic is approximately the same distance from both keyboards.