Hello, I own a STAGI w-15-ln too (since living in Italy and the concertina not being my principal instrument I didn't want to invest a lot of money) but I'm not very satisfied. I began with an old 20 button BASTARI, then I switched to the STAGI. Well, the key heights are uneven: some buttons are higher than others by circa 1 mm (0.03 in -?-), and the first two buttons of the G row, left hand, are stronger than the others to push. More, one of the reeds on the left side sometimes gives a grinding noise, and another on the right side has a noisy harmonic. Last, the instrument is not airtight: if I hold the concertina by one of the straps without pressing any button, it slowly opens and the bellows is quite completely extended in about 5 seconds.
I wonder if I am too finnicky or my instrument is defective. I paid €370 hard case included, so the price was fairly good, but I think I have to have it fixed by someone really skilled.
Ghiro