Reviews, reviews, reviews...

Question: The difference between prior knobs and present use of buttons

I've been doing a lot of research...I lost quite a bit of my hearing in Vietnam...and have difficulty hearing conversation portions of movies or dialogue. I wanted a really good set of wireless that would allow my wife to set the TV to her audio level, yet allow me to increase the volume so I don't have to keep asking...What did she say? The specs on the RS 180 look good, but the comments about the new versions going to buttons rather than knobs for adjustment has me a bit confused. Is the conversion to buttons something that makes using this headset difficult as opposed to the previous RS 160??