The PADI adds balanced XLR output, a "notch filter" (simplified parametric EQ) for feedback control, and a bit more EQ control for shaping tone. Many people find the notch filter useful, but if you're not having feedback problems with your current rig, and you don't need the additional EQ, then it might be overkill.
Extra features aside, and unless you're running a long line to a house mixer where the XLR output would be useful, I don't think the audio quality of the basic preamp circuit will be noticeably different than the GigPro. There's a limit to what you can get out of these small battery-powered boxes. If you're looking for a significant step up in overall audio quality, then you might have to get into AC-powered rackmount or floor box gear.
Lebeda F-5 mandolin, redwood top
Weber Yellowstone F-5 octave mandolin
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