I play a bit of Anglo, in a very limited way and for myself, now and then. If I was younger and taking the instrument seriously, I would buy a Duet for its chordal possibilities. One of the difficulties for the concertina beginner is that, with the possible exception of the Anglo, there seeme to be very little in the way of "entry-level" instruments at a reasonable price. Most of the English and Duet instruments I've seen for sale, new or s/h, cost a great deal of money.

Most other musical instruments appear to have a range of qualities and prices, so the novice can upgrade as they get better. The McCanns and Jeffries of this world are pretty pricey. Now, this is just my impression - if anyone knows better, do tell me!

My old mate Alan Day, with whom I played duets for some years, owns two Jeffries Anglos which, when I played with him, were worth 5 figures at that period. Lord knows what they're worth now!