I use my Intellitouch for tuning all my stringed instruments. For those of a 'svelte' nature, I keep some plastic shims in the case to build up the thickness. Admittedly, I've not had to tune in any excessively loud situations, but it's worked fine for me. I agree that the TU-2 is a fine tuner, but I see one drawback as being the need for a pickup. Many of us just want to keep our unamplified instruments in decent tune.

And, Guest Harpo, some years ago I had a harpsichord, which is tuned in the same fashion as a piano, although admittedly more easily since the string tensions are far less. But never did I use an electronic tuner on it. I had tuning forks for 'A's' of several different frequencies (to match the type of music being performed) and the rest of the notes were tuned in fourths and octaves from the 'A's' using beats to ascertain the correct tuning. After a time, I became quite adept at it and never had any complaints about its intonation in any performance situations.