The 3x3 and 4x4 cigars are made by Davidoff. I believe these are made in "the other" (unnamed) factory just outside Villa Gonzalez, DR and not the main Tabadom factory. Henke Kelner oversees both factories though.
These cigars (like Private Stock) are first quality cigars that are rolled with tobacco that was judged too ugly to roll into a Davi, Avo, Griffin's, Cusano, etc. The cigars are not seconds of Davidoff and the blend is different from all the other lines the Davi factories produces. You could say it is a first quality cigar rolled from second quality tobacco.
The tobacco likely did not get any aging once it was judged ugly; and the finished cigars get no time in cedar aging rooms. These cigars are rolled and shipped right away, and may retailers are frequently sold out of them.
What this means is that you need to age the damn things 90 days before you go smoking them.. If you keep a 3x3 or 4x4 in your humidor for 18 to 24 months it will be outstanding.
-Matt-