I think you guys are too much into mouthpieces an S80 C* is a very good piece if you get a good one . As for the LT it does not work well with Mk7 and up . Here is what I would do. Try a bunch of C*s or whatever you decide on and purchase one. When you get very familiar with it start searching for a better one ( try at least 100 pieces a year it might take a few years to find an exceptional one ) this way you are comparing apples with apples . As soon as you find a better one or one that gives you a slightly different color that you like buy it . Continue this searching with any piece,,, even if you wish to own a few types . You will find that you will get to know the piece and quite knowledgeable about its abilities . resist the temptation to change from brand to brand in search of a specific sound. I play a C* and I can get the same sound as a Meyer ,,Brilhart ,,or even a Rubber Link ,,,there is a little difference with a metal piece . be patient and good luck

Both the scroll shank and modern LT's have a round chamber (and a more closed facing, long facing length), but the scroll shank LT's have thinner side rails (particularly towards the bottom of the window) which makes them blow a little less resistant. I had my hands on a modern LT not too many months ago, and I thought it was decent. But I've had my LT for over 15 years and know it like the back of my hand, so nothing quite feels the same. Frankly, though, with vintage pieces, you never know what the wear will be like - and what used to be a great mouthpiece can end up playing like a dog. So your best bet is to try some modern ones if you have the opportuniy to play test before you buy. You never know, though. Sometimes you come across a nice older piece that just plays gloriously - that or you hand it over to someone who can tweak it if it needs any adjustments... like yours truly...