The best thing is that you can create your own ad sets which are very flexible, so it's perfect for all budgets! I would like to have more flexibility in my campaigns but this platform allows me with its functionality as well; however sometimes there could be some issues when we're using large numbers (1M+ impressions).
We've been able solve them quickly though by contacting support team or even just waiting until they resolve those problems themselves because most times within 24hrs from our e-mail notification everything works fine again ;-) Keep an eye out if something doesn't work perfectly after creating ads set then contact us immediately through their chat tool :) Their customer service makes things easier than ever before :D Our main objectives were reaching new users & increasing revenue per user at high scale levels without affecting quality too much since these sites only receive low traffic volumes.