Received a Serial cable for my Commodore 64 so tested out the Pi1541.
It's working relatively well, though some niggling issues that I need to look into - specifically it does have small issues running with Fast Loaders (ie. JiffyDOS), namely that it will occasionally try to load the CBM File Browser when you hit Shift/Run-Stop despite the fact that you have selected a particular disk image or you'd just get a "File Not Found" error instead. Yet, typing the LOAD"*",8,1 command manually will load the selected disk properly - which is weird, as Shift/Run-Stop is supposed to do the same thing. It doesn't always happen, but I haven't figured out what is causing it yet, it's probably related to the auto mounting of the fb.d64 image and a clash between the regular browse mode vs 1541 emulation.
But when it is working properly, it certainly does as you'd expect - runs practically everything, including games that a regular SD2IEC does not support!
It's only caveat is lack of fast loader support for loading .PRG files, they load at regular loading speed. But that's not a major issue, I can always use the SD2IEC as Drive 9 via the 2nd Serial port onboard the Pi1541 and run .PRG files from that.