I like them a lot. That being said, if you're going to do it at all, you may as well do all 4. Adding the RP-280FAs (to replace my RS-62IIs) made all the difference in the world. The RP-140SAs up front increase the front sound stage to about 1 o'clock from your MLP if you know what I mean. By adding the surround Atmos speakers, it completed the dome of sound effect. I have totally flat 9'5" foot ceilings, so the environment suits the up-firing modules well. I've had visitors over and played the Atmos demos and they always leave impressed. I don't explain anything to them, I just play them. The other night, I was watching The Expanse on Syfy and there was a missile launch scene where they distinctly flew over my head toward my front wall. That was pretty cool and that was using Dolby Surround Upmixing, not even real Atmos. I'm very happy with the upgrade. I think a lot of us try and push the limits of what our homes can reasonably support (and our wallets!) and I have reached a point where my improvements will be incremental unless I totally replace my front sound stage with something even bigger, which is highly doubtful unless I win the lotto and move .