Q. I have heard that Horav Shlomo Miller Shlit”a advises against using the eiruv. Is this true? What is the reason for this?

A. Horav Shlomo Miller’s Shlit”a opinion is that the Toronto Eruv, supervised by Horav Akiva Steinmetz Shlit”a and others, maintains a high Halachic standard and measures up to the accepted conventional norms for Eruvin around the world. However, many G-d fearing individuals, B’alei Nefesh and Talmidei Hachamim avoid carrying on Shabbos even where the best Eruv possible has been erected. The reason is that a city Eruv usually relies on some leniencies such as what is considered a Reshus Horavim, the extance, presence and maintenance of a large area Eruv or in some cases the majority of Mechitzos being built by applying the Tzuras Hapesach principle and other leniencies. (See Mishna Berura 345: 23 and 244:8, Karyano Deigerso 2:96, Ner Torah p. 350)

The above individuals are equally more stringent in the compliance of many other mitzvos, above and beyond what the normative Halacha requires.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a