Thanks for the input here folks.

Replacing the entire system of drip lines in my garden would be a
large and rather expensive chore every season. As a gardening
hobbiest and not a professional grower, I think I'd like to try for a
"permanent" installation.

The drip lines seem to be rather finicky over the long run. I'm
wondering if I could install a series of soaker hoses to replace the
drip lines? Does anyone know of a length limitation in a long line of
connected soaker hoses?