[Gordon Currie]

Yes, I have 20+ years experience with this.

For the vast majority of guitarists, I recommend going NOT with MIDI but instead with Roland's COSM technology, embodied in the Virtual Guitar (VG) series.

As others have mentioned, the process of converting pitch to MIDI is not currently super precise out of the box. The guitar is probably one of the worst instruments to use as a MIDI controller. All the little resonances and response quirks we find so valuable in defining the sound of a guitar, and little playing techniques that bring life to our playing - these confuse the heck out of pitch detection technology.

IF you try MIDI guitar, you will probably have to work for many months to clean up your playing. All the little brushes of a string or unintentional glisses can result in random notes being triggered. Plus, everyone always tries to BEND a piano sound (hint, it really doesn't work musically!).

The best MIDI 'guitar' controller (the SynthAxe) actually produced no sound, only MIDI messages. But guitarists weren't interested in that approach.

Using COSM, each string's signal is analyzed and filtered/reconstructed in a sophisticated method. There is no pitch detection, no practical latency, no glitches or weird noises. And you don't need to adjust your technique!