I have been using ATS-34 for many years now starting with the BM 800 as well. Then the BM 3550 and 9050, then some CUDA's quick actions (do you remember those).
Now I am EDCing a small fixed blade in ATS-34. When this steel has a good HT, I find it to be a very nice using steel. S30V and D-2 have been my recent go to steels until I started carring the small fixed blade in ATS-34, and I feel that I may be leaning towards the good ol' stuff 34.