<HTML>I bought two MusicSorb units last fall and tried them in our home piano, a late '80s Baldwin R in a fairly large living room with masonry walls and fireplace with wood stove insert and almost floor to ceiling glass windows on a long side.  (Not ideal for piano stability.)  The piano has a damp chaser setup installed. I would say the piano stayed in tune longer into the wood stove heating duration than in previous years, but this is only a seat-of-the-pants analysis.  There is no cover and our dicipline in keeping the lid down when not playing is pretty lax also. My impression is that the price of the MusicSorb was negligible compared to my investment in the piano and also less than a tuning.  I believe it provided better stability between tunings, so I am satisfied.  It also is maintenance free, so once you buy it, you're done paying for it.  I would buy it again. Loren Hedahl</HTML>