Found this review of "My Utmost for His Highest" on amazon.de. As it is an anonymously written review, the credibility of it may therefore be HIGHLY questionable, so do take it with a grain of salt.
"Chambers' devotional classic is long on practical advice for Christian living, but theologically confused. This is astonishing, considering the author sat under the preaching of the great C H Spurgeon, heir to the Reformed Puritan tradition. It is mystical, even gnostic or pelagian in many places. There is no mention of a church, of the sacraments. Instead, the Christian "worker" is portrayed as an isolated self-made spiritual giant. The influences are clearly Wesleyan with references to entire sanctification and the second blessing. Spurgeon's meticulous teaching is rejected through Chambers' confusion of the classic Protestant doctrine of justification with sanctification. The substitutionary atonement of Christ on the cross for the sins of God's people is strangely bypassed - instead the crucifixion is depicted as a mystical "higher life" example of how individual Christians are to live. There is much practical wisdom, but READ WITH DISCERNMENT!"