I've been working with PropellerAds for over two years now. At the moment the best network for buying pop and push traffic in my opinion, here are a few points why:

1) Minimum of bots. Traffic is of the highest quality, minimum bot traffic, I haven't seen such quality in any other network.

2) Constantly improving payment models, CPA on pushes (no competitors).

3) A huge volume of traffic

I would also like to mention the work of our support team and managers. Guys are working 24/7, all questions are closed almost instantly.