I purchased the M1 when it first came out and have had all the upgrades offered including the most recent, the Series II. I just got it back from Bricasti yesterday and well, what can I say. For over a decade I've been committed to the M1 and it is a superb sounding DAC in all incarnations. The latest Series II upgrade is awesome and what I noticed immediately was greater depth to the soundstage and delineation of instruments with well fleshed out body and space around performers. I've been through a lot of digital since I heard the first Sony player in 1983 on its way to an audio show debut. The M1 keeps me happy and Bricasti keeps the technology updated and current for a fair price and with wonderful service. So, I'll likely finished a second decade with the M1 S II and take any updates offered along the way. Oh, by the way, my vinyl rig sounds great, but so does the M1 at half the price. Give it a listen, I think you'll find it competes way, way above its price point. I'll leave it at that rather then get into comparisons to DACs many times the price of the M1. Good luck with your upgrade.