I've got the TV+ and I really like the tonal options you'll get. The P-90 in the neck can be rather dark so the piezo can really add some shimmer and glass to the tone. The piezo tone isn't as nearly as nice as some active ones available on certain guitars like my PRS HBII w/ Piezo, but it does offer another tonal option.
The only things bad I can say or say to improve:
Made it 2 seperate stereo signals, a piezo and mag
Made independent controls for piezo and mag
Hate the sharing of the tone/volume controls for the piezo and mag
Would love for it to be setup like the PRS HBs w/ piezos