In my opinion the Instagram connection being switched to the official API and the improvement of the Postoplan localization (especially the English translations) are the only two perceived weaknesses and thankfully Postoplan has already confirmed that they are looking into the Instagram API stuff and that the English translations will be improved in time. I am sure we all recognize that appearances make or break a good first impression so I recommend that the localization and the general user interface gets an overhaul to look more polished, that alone will win over the hearts of many new users but that should not hold anyone back from grabbing this deal now. The API is coming, translations will improve and since Postoplan is moving in the right direction already they could be the next Buffer or even better.

One more thing, I was a whitelabel PromoRepublic user for a year and frankly the experience was frustrating and not a great value for what it was costing me. I suggest Postoplan avoids going that route as it is not worth the effort and also because it would be more efficient to make immediate improvements like the Instagram connection or the overall UX/UI.