Is it true that the UV22HR is available as a plugin for other programs, and if so which programs?
I found it's typically licensed and packaged with specific programs (like WaveLab), as a "built-in" plugin, and not easily accessible as a free-floating plug-in for any program that supports VST or Direct-X plugins.
I performed a dither comparison a while ago, covering a slew of software options. I just now added Samplitude to the list and haven't re-performed my critical listening to leave additional feedback. Not lots of feedback from fellow TSers, but you can get the most important feedback by listening yourself:
http://taperssection.com/index.php/topic,51478.0.html