I LOVE Bialer chassidim (I’m related to some), but I don’t know too much about them. I’ve heard that the Bialer Rebbe is very into being “mivaser tov” (the title of his series of sefarim), which means that he finds the good in every human being. It’s a middah that appeals a lot to would-be baalei teshuva, and he has BH been mekarev quite a number of Yidden. I forgot which area of Eretz Yisrael he lives in, but I know he goes to Tzfat often.
I think most Bialer chassidim are concentrated in Eretz Yisrael. I know of a family in Nivei Yaakov and another in Ramat Eshkol, both baalei teshuva. I don’t know how many chassidim there are, but I would imagine it’s not many, at least relative to the more well-known chassidic sects. It’s not substantial enough that everyone has heard of them.