When I first started playing guitar a couple of years ago, I continued to use the Korg microphone tuner that had faithfully served me for decades playing brass instruments. But it was immediately apparent that resonance from the neighboring strings and other background noise would cause disturbances and make the process take longer than it should. Earlier this year I finally tried a Snark for the first time, and I'm hooked! Since I use it on vibration mode, no longer do I have extraneous sounds wreaking havoc on the measurements. I'm sure there are more accurate devices out there, but for my purposes this is more than good enough.