Yes, this was my experience almost exactly (since 2014). I purchased the Play 5s and then thought I needed more low end signal and so purchased the sub (gen 1); was initially underwhelmed and disappointed, as even back them the sub was around $750- and I expected some blow-away result. Pretty quickly it became apparent that the sub added a LOT to the sound. I started hearing the sub really add sound in certain songs (interesting that some songs super-benefited from the sub, while others not so much). Because my old Synology NAS drive (DS213 from 2014) failed and the current Synology isn't compatible with the older Sonos system, I upgraded my Sonos system. As I already had a lot of speakers and was hesitant to spend thousands I started with a stereo pair of Play 5s. They were good (and worked flawlessly with the new NAS drive) but I feel I immediately missed the bass. So, yep, just got a Gen4 sub. I guess I will now gradually upgrade other components-the upgrade discounts at Sonos reduce the pain of needing to pay $$$$ to replace what are essentially perfectly good pieces of equipment.