I use my detuners pretty much non-stop. My band plays in so many different tunings that it's much more convenient to have the detuner than to swap basses or continuously try to transcribe to a 5 string (which is way more difficult trying to pedal off a drop d tuning the guitarist is using).
If all you ever play is classic rock/pop/blues, in standard tuning you may never need/use one, but if you play modern metal, modern country (where a lot of drop D/drop C tunings are used), or just like 4 strings compared to 5 strings, having one is great be having to stop and retune the bottom string every couple of songs. My band plays in pretty much every key from standard all the way down to drop Eb/A#. Between detuners and pitch shift pedals I can get everything I need with one 4 and one 5 on stage.
If all you ever play is classic rock/pop/blues, in standard tuning you may never need/use one, but if you play modern metal, modern country (where a lot of drop D/drop C tunings are used), or just like 4 strings compared to 5 strings, having one is great be having to stop and retune the bottom string every couple of songs. My band plays in pretty much every key from standard all the way down to drop Eb/A#. Between detuners and pitch shift pedals I can get everything I need with one 4 and one 5 on stage.
