The answer is, ‘it depends’. I could not find too much on the implementation of the M1 digital volume control, but typically there is some risk of signal loss especially at lower volumes. Given the quality of your gear, it may take a bit of coin to find the answer and determine if it is worth it.
My previous amp was a Coda #8 and I tried at least five different preamps with it, each one was different. If you are even thinking of it, I would recommend you try one and see for yourself. It is part of the fun. Be aware that the right cables will make a big difference as you add component to the chain.