From a reader…
Can a Catholic in full communion with Rome use the Breviarium Romanum published by the Econe Seminary (the version used by the SSPX)?
Two issues come forth.
First, only some Catholics are obliged to read the Office.  Those who are obliged, should use the proper texts, either the Liturgy of the Hours or the 1962 Roman Breviary.  
Catholics who are not obliged to read the Office, and who desire to do so for devotional reasons, can do whatever they want.   It would be better to stick to what the Church has approved, obviously.  That just makes sense.
Second, the Breviarium Romanum in the 2 volume

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