Is heavy vinyl worth it?

I've had mixed experiences with 180-200gm vinyl. Far too many discs were warped... some terribly so. I bought two Dylan LP sets on 180gm vinyl. I kept buying copies of "Highway 61 Revisited" because they were all so warped. I got tired of returning them and went back to an old mono version. "Live 66" is much better, but I think it is 150gm. Sibbilance can be an issue, too, with heavy vinyl, so adjusting your tonearm's VTA can be a hassle, esp. if you go from regular to heavy vinyl fairly frequently.

On the other hand, many of my heavy jazz LPs sound great, but on the whole, I won't spend the extra money.

Like Larry, I too have bought an inordinate number of warped heavy vinyl LPs. The only company that seems to be able to produce warp-free heavy vinyl is Blue Note (e.g., heavy vinyl reissue of Kenny Dorham's "Whistle Stop" is excellent). Never had one problem with BN. That being said, I don't consistently find an audible improvement, so I simply buy the cleanest LPs I can find, regardless.