I bought a set of Curry XXX heavyweight caps for my Bach ML43 a while back to experiment with.
They really changed the feel of the horn, but unfortunatley, the changed the feel for the worse for me.
With the XXX Caps on, the horn become incredibly stuffy, I lost about a fourth off my upper range, the slots became way too tight, there was no play for bending/tweaking notes.
In conclusion, for me and my instrument, they were awful - however, one good thing was, that because of the weak dollar and the fact that I imported them from the US (I'm in the UK) I sold them on Ebay for more than they cost to buy! So in the end a wise investment!!!
