I'll my opinions to Dennis experiences.
1. Rubber barrels are a far better bet all round. Quieter, easier to open and close and more efficient.
2. Rubber barrels do not need fins
3. needles in cheap mixed shot leave marks, well rounded needles in good mixed shot are fantastic for getting into places that other shapes don't reach.
I never tumble stones which are lower on the mohs scale than stainless steel (at around 5.5) or those which are organic, porous, or treated. Other than that, I happily throw just about anything - if it's not strong enough to stand up to the barrelling process, it's probably not strong enough to be worn anyway.
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