In my last post on humidifiers, I wrote about my Grover system and how it worked well but I had concerns with it fitting so tight between the strings and the guitar that it might scratch the finish. I was also having troubles with the sponge getting tangled with the electronics in side my guitar. Purchased a Kyser system from Amazon
*Full disclosure: Links within this post contain affiliate links to amazon. I earn commission on qualified purchases.
My Impression:
The Kyser is constructed of some sort of soft/flexible plastic or rubber so no worries that it would scratch or scuff my guitar. 
Installation was simple, easily fitting into the sound hole sealing in the moister in where it belongs. The only drawback I could find in installation was that if the sponge is too saturated, water could drip onto or in your guitar so be careful. I left the humidifier in the guitar for the last three days and it has performed as well as my Grover. The sponge was still saturated and could go for a few more days.
Final Thoughts
The Kyser Lifeguard Humidifier System is a must have for any musician that needs a fair priced ($14.00) and efficient humidifier for their acoustic guitar. With the solid yet soft construction you can be assured that it will take care of your guitar without damaging it.
Update (5.13.08): It has now been about two weeks since this post and the Kyser is still working great. I re-saturated it today for the first time since the posting and the sponge was still damp and probably could have went longer. I must tell you that it was in a closed case the whole time but even in a closed case the Grover didn’t last more than 3 or 4 days. I now have my Martin hanging on the wall. I’ll keep you updated on how that goes.
Update (10.25.08): Just received my order for the Kyser Classical Guitar Humidifier
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