Running G1-3 & D1-3 should I use D1-2?

[Puh Laden]

I'm planning to run GDQ (minus Q1) using 5e rules. I've got G1-3, but not D1-3 yet. I've heard mixed reviews for D1-2 and was wondering if it's worth it to adapt it or if there's a better bridge into "Vault."