Bnei Tzion is an Israeli siddur published in 1996 by Sinai Publishing in Tel Aviv. It's a Sephardi siddur but has some interesting variants (e.g., very similar Havdalah to Ashkenazi practice). I'm looking to find out the specific Sephardic group(s) that use this siddur.
I bought a "pocket edition" of Sidur Bnei Tzion from a bookstore in Paris in 2006; it is almost identical in order and contents (although more reduced) to a Sidur used by Congregation Beth-El of Rio de Janeiro (Brazil). Their Sidur, called "Siddur Matzliach Melamed" was compiled by Rabbi Meir Matzliach Melamed for a Portuguese/Hebrew Edition in the 1960's. He was of Turkish descent, so I believe those are mostly Sefaradim of Levantine origins in General.