What's your opinion on #domsummon?

[Wauthan]

I noticed that a new patch popped into existence while I've been away. The new #domsummon command looks interesting enough so I wondered if anyone have had a chance to test it yet?

In the quick mod I made the ability seems a bit nonintuitive, with the free units appearing in a somewhat random fashion. I like the new command but I'm having trouble creating a balanced implementation. It does seems to help the AI expand a fair bit faster in singleplayer though. Anyone have an example that turned out to be fun ingame?

Also what summons do you feel are appropriate for the various pretenders assuming they all would have the #domsummon ability?