Dorman actually has a couple of decent products oil and trans pans are one of them. Many GM 3800 Gen II engines in the salt belt had rusty oil pans, the OE replacement was NOS so same thing, the Dorman pans held up without rusting.
The only part of it that was a little cheesy was the drain plug threads, OE used a heavy square nut tack welded inside the Dorman used what looked like a rivet nut. Still, they seem to hold up and not strip but if it did there is not enough meat there for an oversize or rethread.