And let's add a comment about build-quality. Impressive!
Granted, in real dollars they were more expensive than today's AF lenses from Nikon and Canon. But the fit, finish, and ruggedness of the the Takumar lenses (and the Spotmatic bodies) are a pleasant diversion from what you see today.
And, even though you don't raise the issue, don't be too concerned about the lack of availablity of original type batteries - assuming you want to use the in-camera meter. There are alternatives (often using inexpensive hearing aid batteries that, while having a limited life, are cheap).