I hope this will be some help but a warning, ignore most of what I say as I am a piega a dealer. However long before this I bought piega p8ltd as a private individual because I loved the sound - ribbons - the speed and air to my ears is hard to beat. The audio business is my passion, but in my spare time I am a surgeon.
I have had them in my home for over 11 years and could have a lot of other speakers but have no desire to switch.
As far as equipment I have had many different things in my system. I find they like solid state amps more than tubes but have them work well with 30 watts of tube power - less is not great. Certain solid state amps I did not care for, these tended to have lots of watts but were not very musical. Preamps can be tube or solid state, I have had both sound very good but if one characterized the solid state preamps they are more on the tube side of sound.
As for cables they are very good at distinguishing between cables but it is very much personal preference. Very fast sounding cables are not a great match.
Overall I too find the speaker line very neutral, open and accurate - though not overly accurate.
I have not mentioned brands because I don't like to thing I am plugging x,y or z. If you have more questions drop me a note. Happy to chat
Good luck, I have enjoyed mine for many years