My custom Mach's arrived yesterday after placing the order on April 1st (edited) - basically a 10 week turnaround. 120 degree soft boot, flex level 3 (Supreme), with Stabliflex rather than Slide as I prefer some give on the pad and landing area.
Already got on the ice last night with them and overall positive impressions. Hot rebounds as to be expected, as I went Pro Custom I got a smaller balance plate (NHL spec) rather than the massive pillow (which is honestly too big imo), and the new calf strapping system is a game changer for me. The pad feels connected to you, but also allows for a smooth rotation while sitting the pad a tiny bit higher on your legs. It's better than the professor strap and there's no reason to strap the knee block to the wing anymore.
The one concern I have so far is they definitely don't slide as well as the 3X or Hyperlites. I've seen others report this as well, and I'll update after a few more sessions but I can feel more dragging during the slide and throughout the game there was significant build up of snow along the landing area which hasn't happened with any of the other pads I've used recently. TBD after more sessions, but it's a bit disappointing considering these were supposed to be an improvement.
I've seen a fair bit of chatter around the modified landing area for the calf plate in that its not perfectly flat - I honestly didn't notice the change and these pads are perfectly balanced / planted while in the butterfly. They feel glued to the ice once you're in position and with the new strapping system I found it easier than ever to push off while staying connected to the pad.