In reply to mgg:
Walkhigh Mountaineering stocks some Cassin gear including the Piu:
http://walkhigh.co.uk/acatalog/Belay_Devices.html
Why do you need to retire the ATC? The ATC XP/Guide are very nice devices. Smooth on giving rope yet good friction on catching falls. A friend of mine has the Cassin Piu but later on bought an ATC Guide instead. The ATC Guide works better on icy 8mm rope than any other devices I've tried. The standard ATC XP is a bit wider and works smoother on 11mm indoor rope.
Mammut also make a device very similar to the Piu call Matrix. They are both a bit lighter than the ATC guide but I reckon the Guide grips better. I don't like the Reverso personally - too bulky and not very grippy. The new one looks like a better design.
The only Cassin gear I own is an old 'Extreme' ice axe which I quite like. Pretty good build quality.