I have only had one issue with this tuner . . . it does not like the headstock on my Ovation Custom Balladeer 12 String guitar (I suspect it would not like any Ovation headstock due to the unique shape). This unit was the most friendly of any I have ever used with ambient noise affecting the reading and tuning less than any other clip on or body mount I have used. I find that I am most happy with a tuner that I can run in line with an on-board guitar pickup and then on to an amp or sound system direct . . . so I ordered a StroboPLUS HD to round out my collection. I so wish that a package with a durable carrying case (I am somewhat obsessive with protecting of all my equipment) that would add some form of transporting damage control for this unit . . . it was not inexpensive but to date, the finest tuner I have ever used.