We have been working not so long ago, but we have already had a pleasant impression about this grid)

We are trying to launch traffic with the guys with push / in page push + we plan to test other formats!

Of the advantages:
- saporta's operational work (they respond almost always and at any time) 
- adequate cpm/cpc price tags 
- replenishment for any amount 
- moderation is fast enough 

Minuses:
- I haven't found them at the moment. For now, we need to shed more traffic and get expertise in order to conduct a full-fledged analysis.