I personally like the QY700... but I would never buy one. Some people like them and others curse the day that they were ever made...
Some people think they sound fantastic, others think of them as toys.
A few questions:
1) This item came out in 1996 (I believe) so they can be found used. How much are they asking?
2) What does he want to accomplish with this?
3) If he wants a portable solution, have you considered the Yamaha QY70? Same features, smaller, more portable, and costs less.