I'm certainly no expert, but these are radio transcriptions for his show which he made years ago. They are devotional more than scholarly but for a pastor I think they might be of value. Certainly perusing a volume or two will let you know if it might be useful. I have heard him preach on tape and he was a powerful preacher.
They have value. In my opinion, they are not as good as Boice's 4-volume series. However, there is an excellent discussion of the Virgin Birth in volume 1.