McDermott Defy 12.5 3/8-10 Navigator Automatic SuperSoft
I've been playing the Defy now for about 6 months, so for what it's worth I'll provide some feedback because I too was having a hard time finding reviews before I purchased it.
As for availability, I trialed all the McDermott shafts by connecting with the nearest McDermott ambassador. My shaft was ordered in March and I received it in June (their shop was closed due to the COVID situation for several months). Not sure what the delays have been due to for the stories already detailed in this thread, I for one didn't have an issue getting my hands on one though.
I played with an original 314 shaft &/or the McDermott I2 going back about 14 years. Therefore, there was some learning curve going to a low/no deflection CF. With a few weeks practice to learn how to "straighten up" my aim point, and re-learning where to sight high-english throw shots, I overcame my initial struggles.
As for the shaft itself, it is indeed a nearly deflection-less shaft. So as far as that goes, it was the lowest deflection (I'd say the Jacoby Black was a tie) as any CF I tested (which included the Cynergy, Revo, Rogue, & Jacoby Black). What completely sold me on the shaft though is a matter of personal preference, and that is the sound & hit. To me the Revo feels like hitting with an aluminum bat. The "tink" sound and feel of it is something that I could never come to accept. The Cynergy and Jacoby are less "tinky", with a lower pitch more solid feeling "tonk" sound. Again, completely personal preference, but was still too foreign a sound and feel for my liking.
The Defy on the other hand is by far the quietest, softest feeling CF that I found. As described by many others, it's almost like you can't feel the impact at all. If you're a golfer, it's like the difference between going from an old Ping slotted (aka "beached") putter, with that high-pitched vibrato "ping" sound, to the first time you putted with an Odyssey with a rubber insert that provided a drastically softer hit. Paired with the standard Navigator Automatic SuperSoft tip, this shaft has the softest hit I've ever played, which is what I was looking for. Furthermore, there's nearly no vibration felt in the hand and absolutely no tink or tonk sounds. No, it does not feel or sound like a wood shaft. But if that's your desire out of a CF... you should probably stick to wood anyhow.
As for the maintenance, I've only ever used a micofiber cloth to wipe the shaft down. I play Predator chalk which is known to be one of the dirtiest chalks, and I've still never had the need to use a wet cloth, or cue silk or anything but a simple microfiber cloth to keep it smooth and clean.
My three negative feedback points for the shaft are; 1) the NavAuto SS tip has mushroomed on me within 4 months, practicing average of 14 hours a week with 2-3 league/tournament nights. This is somewhat natural of a supersoft tip, but I think it mushroomed faster than other tips I've played in the past. 2) McDermott doesn't specify the taper details in their advertisements, nor could I get the actual specs from the manufacturer directly. Measuring with a micrometer myself I estimate the straight taper section to be approximately 14" before it begins to grow in diameter. So if a long Pro Taper is your desire, the Jacoby Black may be up your alley with its 19" pro taper. and 3) the first line of Defy shafts had no visible color contrast where traditional shafts ferrules are located. If you're one to use the ferrule for some kind of aiming system, or simply need some color contrast to have a hint of a traditional look, then you'll need to order the 2021 line of Defy where they've added a contrasting grey color to differentiate shaft from tip.
It'll be my playing shaft for the foreseeable future. Great action, very low deflection.
That's my 2 cents...