Poison Golems, Harvesters, and Bane Venom Q's.

[Uh-Nu-Buh]

I like Harvesters, and in an SP game I finally tried out a Poison Golem. Not sure what to think. Here are my non-pluses:

1. It isn't stealthy
2. It doesn't seem to heal, even in a lab.
3. It is a killing dynamo on the battlefield.
4. It dies after taking 2-3 provinces.
5. Because it is non-stealthy, the disease/poison effect is only effective against your own population....

I can't see any way to make this interesting and fun fellow an effective part of my military apparatus. Am I missing something?

In a similar vein--I equipped a Harvester with a Bane Venom charm. I can't tell if it is twice as effective or not. How can you tell how much chaos and destruction your Harvesters and Bane Venom charms are wreaking?

Thanks!