Not so long ago I started working with propeller ads. But I have already achieved good results. The support is excellent, no problems with the quality of traffic. All kinds of formats to choose from, pop, push, interstitial. Pricing model is CPM, CPA goal, SmartCPM. Everything that you need.
As everywhere else offer to test. It's not so long ago that you took any offer from affiliate program, run the campaign and immediately went a huge swarm. But with proper testing, there will always be a good result.
Separately, I want to tell about the CPA goal. This is a model where you set the desired price for the result (lead/registration/install, etc.), and the system will search for sites and segments (browser + phone model + language) that offer a given price. And all this on automatic. It only takes a few days for the system to test the segments. During this time, payment goes on smartcpm, after the tests are completed, the payment will be for CPA (for conversion).
Customer support is excellent, always helps.

And a screenshot of the stats from my personal account.

Profit to all!