I was under the impression that all the negativity was just some perfectionist audiophiles complaining about things inaudible to the average listener, but this really is a horrible mix. Not only is the missing channel audible, it's painful. If you fell in love with this record through listening to the original pressing (or it's really popular rip on YouTube), don't waste your money on this or the ones by Fifth Dimension. Just wait for an official reissue or (more realistically) save up for the original.
The album does best when steering away from the early New Age template, to be honest it still sounds like Mort Garson we all know and love. Unlike his major label albums, Mother Earth's Plantasia was only available at furniture outlets (in Southern California, apparently) when you purchase a Simmons Mattress.