I've only ever owned one clarinet, a 1989 Vito 7214 which was given to me by a friend in 1989. I do have quite a few saxophones though. I've had far more opportunities on sax over the years than clarinet. If I played more, I suppose I'd have a reason to upgrade. Vito still plays well enough. Can't complain.

I don't see any latches on the Protec.

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https://syncopatedtimes.com/

Great stuff. Thanks!

From looking at videos of traditional jazz saxophonists, they almost always have the double lip. Clarinet seems to be half and half.

When I was a young tyke in middle school, the band director considered double lipping a crime, so I've always had that mentality.

This is 100% wrong. Double lip is extremely rare in jazz saxophone. Of the hundreds of famous players I'm familiar with, I can count on one hand the ones who played double lip at some point, usually due to physical problems that left them no other choice. Regardless of what you think you're seeing, most have their teeth firmly planted on top of the mouthpiece because that's what works best.

I would expect the proportion of double lip in the jazz clarinet to be higher than in sax simply because it's a little more mainstream, but still fairly rare.

I would recommend double lip only to the few players who may experience serious discomfort in spite of using patches.