Feldheim Publishers has published this edition, too. In fact, this is the edition of Derech Hashem that has replaced R’ Katz’s spoken of before in Feldheim’s library. They have also published quite a number of R’ Efrati’s other Ramchal works.
R’ Efrati also presents us with many fine explanatory notes, but his greatest contribution to Ramchal studies, to my mind, is his reference to other Ramchal sources where the same themes are discussed. The latter makes this work an essential addition to one’s Ramchal library.
(c) 2013 Rabbi Yaakov Feldman
Feel free to contact me at feldman@torah.org
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AT LONG LAST! Rabbi Feldman’s translation of Maimonides’ “Eight Chapters” is available here at a discount.
You can still purchase a copy of Rabbi Feldman’s translation of “The Gates of Repentance” here at a discount as well.
Rabbi Yaakov Feldman has also translated and commented upon “The Path of the Just” and “The Duties of the Heart” (Jason Aronson Publishers).
Rabbi Feldman also offers two free e-mail classes on www.torah.org entitled “Spiritual Excellence” and “Ramchal”.