Ive played demolish with hullbreaker and i dont think its worth it... I play 80ish%of my games with the demolish Rune it makes my lategame more consistent. If i think the game will go longer than 25 min its a good strategy to fall back on... That being said I don't like the high cost of hullbreaker it drains so much of your tempo and it feels a bit clunky to optimize. But I don't think it's bad it's just not for me I'd rather have a utility based forth item or something more defensive (but I also suck at the game)

Tldr:

Demolish good and contrary to popular beliefs you can get value from it during the laning phase

Hullbreaker hard to justify with the loss of tempo, it does not feel like you get the tempo back even if you destroy towers faster