I have a tank somewhat similar to that, and have found it almost completely worthless.

Only "almost", because I have used it successfully with half-strength FX-2:

Prewash
Pour out water, pour in developer
Pour out developer, then pour it back in
Repeat developer pouring twice more
Let sit for 90 minutes or so

Pour out developer
Pour in water (or stop), do the out/in a couple of times
Then do the same with the fixer.

For any other purpose I would rather use just about anything else. I believe even a black plastic bag would give more even development.