Right, I've only had chance to experiment with the tenor pieces so far but here are my thoughts on those:
Sax: Selmer mk7
Reeds: RJS 3s
Regular Mouthpiece: Aizen LS 8
Absolute metal: I should start with a caveat that I rarely get on with metal mouthpieces; I just prefer the feel and broader profile (usually) of ebonite. Having said that, this is clearly a very well made mouthpiece which was easy to play from the outset with no tuning issues or difficulties at extremes of register. The tone isn't too bright (thankfully), with plenty of warmth across the range of the instrument. It's very free blowing and adaptable, easily capable of smoky subtone and a harder funky/rock sound. I found that if I thought of the sound I wanted, it produced it easily, with minimal 'work' on my part. A very good mouthpiece, though as I said at the start, I prefer ebonite.
Absolute ebonite: I really like this piece. I generally go for a Link kind of sound (if there is such a thing) and found that I could get somewhere near to that with this, however it has a slight Selmer Soloist style compact 'roundness' to it. Another very free blowing mouthpiece with a responsive, adaptable character. I actually prefer the lower end on this piece to that on my regular Aizen LS, although, like Griff, I found the top end to be lacking a little punch and it seemed thin around the palm keys in particular when compared to the Aizen. If I were mouthpiece shopping tomorrow, this would definitely be on my shortlist as I'm sure that experimenting with reeds could inject a bit more oomph at the top.
I'll play with the alto and Bari pieces tomorrow.