RG3120 vs. *RGT3120
I can chime in here with Brian...I also have had the good fortune of acquiring an RGT3120DB, and have been extremely happy with it. *I've also had a 3120 in DR and more recently in TW. *The 3120s are excellent guitars, but if you like the Ultra, the RGT gets the vote. *If cost is a factor, the 3120 is a great value (around $700 used), but the RGT, as Brian said, has a solid feel. *The RGT has a gloss neck, which may or may not be OK with you.
The tone of the neck-through is different. *I've been trying to articulate it, but not sure if I can. *Chords seem punchier, and single notes seem to be fatter & sustainier sounding, whereas with a bolt you get more snap & quack, with livelier pinch harmonics. *Hope some of this helps. *I'd be curious to hear other's impressions of bolt v. through tone.