I have played G70 in the store, and to my ear both the sounds and the styles that I have tried sounded excellent. I would take issue with the excessive reliance on touchscreen for navigation, and a few other things (you can search for my recent comments on this subject), but not sounds and styles.
Of course, I don't own the instrument, and perhaps Mike has come across some really bad sounds and styles, which give rise to such a negative review.
However, i think there is a different explanation, and it has to do with the fact that liking sounds and styles is an extremely subjective matter. You may very well like them like me, or you may hate them, like Mike. The only solution is to try the instrument yourself.
You can read this forum, and check out what people's gripes about this (or any other) instrument are. Then, when you play it, try to pay particular attention to those concerns, and decide whether they will pose problems for you or not.
Good luck,
Alex
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Regards,
Alex