I've tried Vserv and InnerActive now, and they both lack a function I would VERY much like to have: The ability to load the ad first in the background, and display it later.
Currently both systems only offer to load and display the ads in one go, meaning the user will have to wait while the ad is loading.
I have of course written both of them suggesting that they implement this feature. I imagine it's a rather simple change actually. But I'm not counting on it happening.
So, are there other JavaME ad systems I can use that offer this?