At the outset, there is no mouthpiece maker I've played (and believe me I've played a lot of top end stuff!) that can equal Breslmair for quality - they're always flawless, multipart mouthpieces made decades apart fit with absolute precision.
Where this differs from the standard/traditional Breslmair offerings though is that it's all one piece - no options for switching rims, cups or backbores.
You buy it as a complete package and a complete package is what you get - a simply excellent piccolo mouthpiece in a medium cup diameter and depth and a steep dropoff from the rim, which may be especially welcome to players who typically choose bigger mouthpieces on their Bb trumpets.
Shank length is extra short (think Wick cornet kind of short) and you get a lovely "roomy" feel to the slots, with plenty of space to manipulate pitch without feeling too locked in.
Tone is indeed warm - perhaps a little too warm for my particular taste, verging just into cornetty territory... Whilst this makes it an interesting proposition in its own right, it does make me question the need for the deeper (Pic-7) model in the lineup.
With the above comment on tone in mind... Eb cornet had to be tried - and yes, it's an excellent tool for that also, with appropriate tone and excellent intonation (though with a slight loss in focus above high C).
This is a truly outstanding bit of kit and whilst not quite what I was expecting it'll definitely go into the arsenal for use when the tone fits.