Impressive accuracy and tracking speed. I've never seen anything in the market that comes close to this. The sweetened tunings are awesome. This tuner brought about a major improvement in my guitar sound which way exceeded my expectations. I was a long-time user of the IOS-based Peterson tuner which is good but difficult to use in live settings due to noise interference and suboptimal performance of the cell phone microphone and decided to take the plunge and go for this option - money well spent. Mounting Velcro to the pedal is a challenge as I didn't really want to rip of the rubber base but it seems to held onto the pedal board OK now. One also need to be very careful with the large glass display panel.