Cremer's lexicon was at the cutting edge when it was first published. In many ways it4 was the model ffor the later 10 volume TDNT.
But like Thayer, it is also now dated, ante-dating the use of papyri and inscriptions for understanding the significance of Greek terms. BGAG is far superior--though iit too is not infallible. Fred Danker and I sat together in seminars at Washington university,, were colleages from 1954 until his recent death. I was often in his St. Louis apartment. Read the preface to his edition of Bauer to see how things changed from Thayer to Bauer.
Older works are often very helpful, e.g. Schwyzer Debrunner and Kuehner-Blass-Gerth. But grammars date less than lexica.
Prof. Emeritus of NT
Lutheran School of Theology at Chicago