Do any Orthodox Christians here use non-Orthodox materials (Breviary, Missal, Hymnals, Prayer Books) for there devotions at home?
Are you talking to Eastern Orthodox or Oriental Orthodox?
As an Eastern Orthodox, I don't feel the need or interest to use non-Orthodox materials as they pale in comparison. Especially when compared to "The Ladder of Divine Ascent" and "The Path to Salvation" by St. Theophan the Recluse.
I have always considered the OO to be fully and completely Orthodox. With that out of the way, I would disagree that some of the non-Orthodox materials "pale" in comparison. I have a translation of a German breviary (Lutheran) where nearly every word predates the Schism since it is based on the old Latin books in use at the time of the Reformation. In fact, in the short time that I have been using it, I have yet to sing a hymn from it that was written later than 1000 AD, making them fully Orthodox. And since half of it contains the full Psaltar set to Gregorian Chant, the writings of David did not give up their beauty and power just because they were not translated by HTM.
I have been using this Breviary and the Roman Missal for my weekday devotions since I have everything in two books, unlike the Eastern services which require many books to properly conduct. I have not checked into any of the Orthodox Western Rite materiel yet since I have heard from some people that it is lacking. However, if someone has some suggestions, I would be willing to look into them.
BTW - I have most all of the Eastern Orthodox service books, or should say that I had them since I donated most of them to the Church which had very little in English. I was just looking for something a bit more compact.