Ive had a Tonerite on my Larrivee LO9CE for 5 days now, I rented it from someone to try before I buy, I have taken the guitar off the tonerite a few times to play it briefly but have noticed no significant differences, but I have a feeling the strings are dead and once new strings are put on I will be more able to tell the outcome of the tonerite process, my Martin is next in line before my brother gets it to use on his D35