I find it especially useful when re-tuning, like in between sets at gigs, and it doesn't have far to go to reach perfect pitch again

If you have any hearing issues such as being a little tone deaf as I am, this is just the cure for less than precise guitar tuning.

and it gives a green light and beeps when the respective sting is tuned

Use it on everything that doesn't have a locking nut/adjustable tuning bridge.

"tune up" function, which means you're tuning up to a note, not down, which has always held a better tune in my experience

Obviously it's a bit of a luxury, you can get free iPhone tuning apps (or however you tune) and turn pegs yourself, but this is cool.

so I am in a LOT of situations where tuning is critical

For starters, I’ve never had an issue tuning my guitars before

Dials in perfect tuning every time - no matter what tuning you want to use

Smooth tuning and quick action keeps you on the go, ready for anything that comes your way, mainly cool Rocking and Rolling or what ever your style...this can get you there

Plus, it's just darn cool to watch this thing put you into perfect tune so fast

It does not have the power to complete the fine tuning adjustments on my guitar with slotted head stock tuners.

Accurate, spot on tuning is key to sounding good, Roadie 2 makes tuning, and staying in tune easy

It's important to have the tuner seated well on the button when tuning, as it automatically moves to the next string once it beeps for "tuned".

If you get this be sure to download the app also, one thing the app did for me was being able to set the tune to top down (high E to low E) vs the default low to high.

The Roadie 2 does a poor job of tuning the Low E, A and D strings, this even after the latest firmware updates.