I have reviewed several Legacy Audio speakers for Dagogo.com, if you care to read the reviews. Upgrading to higher models is worthwhile, as the performance changes dramatically. I owned the Focus HD, then the Focus SE, and went to the Whisper, finally doing some upgrades to transform it into the Whisper DSW Clarity Edition.
I have not reviewed the Aeris, so I cannot speak about that first hand, but the leap from Focus SE to Whisper is enormous. The performance spectrum, even within a line of speakers, is much larger than you think.