What's new
In addition to the features available in the TH3 Full version, TH-U Full includes:

15 new amplifiers, including the Superlead and Superbass models, Polytone jazz amplifiers and DVmark Triple 6 head
14 new cabinets
Rig Player (with 20 factory rigs), reproduces models captured from real rigs with the R2M (Rig To Model) technology
Amp Tweak: mod amplifiers by customizing pre and power tubes
A Shimmer Reverb and a Shimmer Delay
An improved and redesigned Cabinet IR module
A new multitrack looper
Search function on the preset and bank lists

Whats new in this version:
Official site does not provide any info about changes in this version.

System Requirements
Macintosh® Intel Core i3 1.4GHz with 4Gb of RAM, 1280x800 video.
Mac OS X 10.7 Lion and above are supported.

Homepage