Radio Replies was one of the first books I read when I started reading Catholic books.
I didn't want to give up my faith, but knew how ignorant I was about the Faith. It helped me realize that my Faith wasn't ridiculous, etc.
I think they are very good books, and important for today especially, with so many non-Catholics all around us. We NEED to be able to answer them. Just consider the time spent reading them a work of charity, among other things.
We owe ourselves, in Charity, to be able to explain at least the BASICS of the faith to those in darkness around us.
If we can't explain many things, and don't try to remedy that, we'd better be "under-equipped" talent-wise, otherwise we're in for a VERY harsh judgment after we die.
In Christ,
Matthew