I own a 2001 Guild F-412.
It is a factory 2nd from Corona when Fender shifted Guild from Westerly.
It has a faulty clear top coat only.
It has Maple back and sides and features an unbraced arch back.
The neck is dead straight and it holds tune for months.
It is very loud and clear with a balanced tone, just a nice bass/treble mix.
It is heavy, probably one of the last dual truss rod models before Fender modified the neck.
Very low action, I love this guitar and would replace it with the same if I lost it.
I also have a Taylor 355 which is a slightly unfair comparison because the Guild is a higher spec model.
The Taylor has a thinner neck profile that some may prefer, I'm comfortable with both guitars.
The Taylor was the guitar that convinced me that the jumbo body was the right direction for the 12-string sound I was wanting but it was the Guild that went 'bang there it is!' The Guild makes the Taylor sound a little too jangly.
I don't have a rosewood Guild F-512 but my Martin Grand J12-40E Special is a full size rosewood jumbo 12-string and one of the few guitars that rated a tiny bit higher than the F-512 - but at twice the cost it was dropped from production after just 3 years, only 231 were ever built. It has a much richer, deeper, warmer tone than my Guild F-412.
I use the same strings on all my 12-strings D'Addario EXP38's and keep them all tuned down a 1/2 step.
Another beautiful rosewood jumbo 12-string is the Taylor 855.
This Guild F-412 listed here in the AGF classifieds is an absolute bargain, it's just under twice the cost of a new Taylor 150e for 10 times more guitar!
http://www.acousticguitarforum.com/f...d.php?t=367389
If I didn't already have one, I'd buy this myself.