Indeed it was the speed and stability of the M1 that really got my attention. For that to be the case out of the gate is almost unheard of, though it isn't their first dap, it's still to be commended. Look at what Fiio did with the X1ii, and after so much experience accumulated from previous daps, it's not really excusable except to show that their attitude towards software is as immature as their software itself. so I think there is potential at Shanling to have a more serious approach to the total user experience, and not be satisfied just selling pretty boxes, the end users won't be, so neither should the manufacturers.
Apparently X1 II uses a linux-based OS instead of the old RTOS they used on their other products. Don't know why they made this change but in a way, it's their first time doing a fw like this. It was the same with the xDuoo X3 when it came out iirc.