[Ironhawk]

It would be very unlikely that I would enter into an agreement like this. Its better to bind someone closer to you with beneficial trade agreements and war pacts or alliances. This seems like an unneccessary half-measure b/w a regular NAP and an alliance.

And as others have noted, I also prefer time-limited diplomatic agreements because they relieve the often tiresome nature of the standard NAP-3 fever which seems to permeate Dominions.