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.

The quality of the vinyl is usually better which results in lower surface noise and less pops and clicks, but it only really makes sense to consistently go 180gm and greater if you're willing to adjust your VTA (and other settings) on your tonearm.

I guess the answer must be, "it depends". For us the 180/200g issues are definitely worth it. At a minimum, classical reissues on heavy vinyl tend to have quieter surfaces and less warpage.

Heavy vinyl usually accumulates much more statics than regular. In case with 150g you can get away without VTA adjustments while 180...200g will likely need it.

I set my TT up using heavy/thick LP stock and add a second "slim" wool felt mat when playing thinner LP's.

I do not hear much of a difference between thick VS thin LP's as long as both are flat and in good condition. My TT is located outside the listening room, I use a non-clamping LP weight and I do not listen @ high volume levels (which may have something to do with this).

The only big step "up" for me (amongst recordings that are decent to start with) are the 45 RPM versions.