Since no one else has piped in yet I'll give you my 2 cents, at least on the Kessler.
It's 50% plastic and 50% HR
Straight wall chamber
Based on vintage metal Otto Link
This is my first and only tenor mouthpiece, so far any way, so I can't vouch for any performance comparison against any other mouthpiece but I've been very pleased it it so far. Kinda wish now that I had upgraded to the Kessler OL7 Pro but at the time, all my experience had been with an alto and I wasn't sure how I would adapt to a mouthpiece as open as this one. So I didn't opt to shell out the additional bucks but it been far so good!
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