the concensus among user/posters here seems to be 99%+ enthusistic, not just for the great concept/great execution, but also because "the thing just sounds damn good"
However, there seems to be an audiophile minority among sonos devotees who appreciate and respect sonos for the above reasons, but wish they could still have their high-end amplification in a sonos environment.
The ampless ZP idea has been publically rejected by Sonos in this forum as somehow not working in the cost/pricepoint/target market space they have defined for themselves, which is perhaps understandable.
So many use a ZP's line outs to drive a high-end external amp in their prime listening area, effectively wasting oneZP amp (a decent amp at that!)
I suggest the obvious solution is a higher-end, higher power, higher priced ZP. Imagine a $7-800 ZP with the same features and functionality, but built around a top-of-the-line Tripath chipset with something like 100-150 watts RMS per channel @ 8ohms and even better attention to audio quality than the already fine standard ZP.
tells us, Sonos, might such an idea figure into your future roadmap?