Here’s what consumers have asked with answers from GSA Software Development And Analytics staff and previous consumers.
Indeed we are no scam but a legit company. We exists for almost 15 years now.
Success stories are all over the Internat. But you might just as well ask your detailed questions on the forum: https://forum.gsa-online.de/
We as a company signed up lately on this platform, so sorry for my late reply. We are usually answering support questions and concerns instantly. Though we are located in Germany (as Hannes J. Already pointed out) and we might reply with a certain delay due to our sleep ours.