This is the second Yamaha TransAcoustic guitar in my collection, I also have a Yamaha FSC-TA.
If we compare them, the new TAG3 is definitely better. The overall quality is better, and especially the quality of the neck lacquer is much better. The guitar feels very good in the hands. The sound is very good.
The big advantages are the built-in battery and the looper. The battery lasts a long time.
But the looper can also be considered a disadvantage - there are two ways to start recording on the looper, the first is to press the record button, which is not convenient because the button is on the main control panel, you can't quickly press the button with your right hand and start playing. So there is a second option that starts recording automatically when you start playing. And there's a problem here, because the sensitivity of this threshold is very low, and you have to hit the strings very hard to start recording. If your part starts with a chord, it's not a problem because it will be quite loud, but if the part starts with a single string or a quiet chord (or a pick), it's a problem because the guitar won't start recording at the right moment because it will be too quiet for it.
Overall, I recommend this guitar, but if you're buying it for a looper, I'd advise you to try it first. For myself, I decided that I want to buy a looper pedal separately.