GLS drags down your customer satisfaction
GLS repeatedly fails to deliver to my home address, but instead claims that I wasn't at home (which is not true) and just delivers to a parcel shop that is convenient for them to reach, instead of one of the parcel dropoff boxes in my direct vicinity.
I then have to take an hour out of my day to go to the shop and retrieve the parcel, which ruins the experience of online shopping: I order online because I want to have the convenience of not going out to get something. If I have to go out anyway, I'd rather go to my local smart shop instead and support the local economy.
As it is right now, I will avoid online shops that only offer GLS shipping. You'll lose me as a year long customer if there is no other option in the future, which is a shame, since I always enjoyed everything else about Zamnesia and would give a 5/5 star rating otherwise.