I have been working with Advertise.net for about a year now and during this time I have only positive feelings about it. I work with the gambling  vertical. They always have something to fill up on the offers, as well as constantly open new geo and give it to the test. Payments have always come on time, sometimes even faster. They always reply and find out if there are any problems and will help them if necessary, will give specifics in any unclear situations, special thanks to Irina :)

I recommend to try this service in general.