I have no first hand experience, but i would stay away from them. Their whole course is tailored to reduce costs, e.g. distance learning over regular ground school, flying DA20 and DA 40 in Croatia... but it costs considerably more (around 70.000€, not including housing etc... )than a regular integrated course at well-known german schools (e.g. RWL...) . Regarding the airline network, it's still questionable if it provides you with any advantage in job finding in Germany, and i doubt it very much that it's of any use outside Germany. After all, we all get the same license and it's only you that can get yourself a job, not the school.
Don't get me wrong, they may be a decent school, with good instructors, planes... but i personally think they're completly overpriced for what they offer.