"Whisper Quiet" or "Dual-Ducted" Air Conditioning - reviews?

There are a bunch of mfgrs. of mini-splits now and they are silent... I've installed a few. I put in a Mitsubishi and I was leaning over the condensing unit reading the manual on how to work the remote and the unit came on while I was reading. I wouldn't have known it was running but my pant legs were blowing. Some mfgr. just needs to build them to work in an RV now. I'd love to see 450 cfm/net ton so it works on the sensible load more. Craig