When I got a hold of the white box with most of the D&D books and Arduin Grimore, I began combining the two because I found some of the spells and monsters in Arduin to be deadlier than in D&D.
Favorite campaign I ran was always Halloween themed that lasted over two days. Usually I got a sick pleasure over killing most of the PCs in the adventure but the last two I ran, one PC killed my Vampire after a battle that lasted practically two hours.
I've not found people who play in my area because most are into video games or have families now. I kept all the books with the white box and the supplement books that followed but I gave away all my 1st Edition AD&D books for which I do regret to this day.
3rd Edition fell short and since the advent of 4th, WoTC sucks money out of their players and that is such B.S.
I am working on throwing in more from the Arduin materials. The point that it is proof that there are no limits cannot be emphasized enough. I also liked GM's comment that the first three Arduin booklets constitute a kind of "DMG" for OD&D.