Hi Marvin,
An 818v3 is probably fantastic, but I think the current pricing is about GBP 5k second hand. If you find a 818v3 for a Farad super3 + 218 price (<GPB 1200), please let me know first.
The upgrade was no hassle for me and leaves me with a capable and compact streamer. All the Meridian functionality still works, there is no difference in behaviour. Still no idea how if would compare to an 818v3, all I do know is that the PSU upgrade made a difference worth the money for me. On another note, I think it makes a lot of sense to keep the PSU separate of digital devices. Every device needs one, and its task is very different compared to the other circuits. Maybe we will see more separate PSU's in the future that powers several components.
Regards

Main: DSP8000SE< 218 < Farad Super3 TMCB < PS Audio P10. Room correction: Focus Fidelity.
Second: Fostex Fe206NV2 < Audio innovations 500 valve amp < Wiim Pro +
Study: DSP33 < Reviver < MS200
Server: ROCK + Tidal on NUC, fiber on 2x cisco 2960, HD-Plex LPS.
Gone: DSP7200SEu, DSW, DSP5500mkI & DSP5000mkI, 508.20, 210