The tuner is excellent. Its polyphonic tuning system is the niftiest thing I've ever seen on a tuner and its strobe tuning mode as accurate as one of those big strobe tuning units, but its display is kinda dim.
Polytunes have been my favorite tuner for a while. I've used a few others and they were all fine, but having the quick poly function is great. I use mine in an always on, buffered bypass mode. I also daisy chain some lower pedals off of it. Great utility pedal.
Instead of having a dedicated buffer in front of chain. This is a good idea since tuner is mostly put at the front of the chain. Although it is $15-20 more expensive than polytune 2 but for extra buffer option I consider it is a no brainer for those who have a lot of pedals and long cables.
This pedal makes tuning a breeze. Individual tuning is perfect; strum tune is amazing. The buffer is subtle but you can tell the difference if you have many effects as I do.