Rock Band 3 MIDI Gear dig it or not?

CDM has a good post about Rock Band 3 Keytar MSRP: $79.99

Any idea if  Rock Band 3 guitars with midi out are any good as well?

MSRP: $129.99

Yes my friends this is Fender Squier for your Xbox and for MIDI

MSRP: $149.99

And what about the other way round?