Impressed with the views, just make sure to get the basic entry tickets, as they try to up sell you on a lot of items. The Skyclimb isn't worth it, only 10 floors up overhanging the edge platform, and i thought you would be hanging on the other side of the building.
You can be assured, the glass floor ceiling is German engineered :)
If booking online, make sure you take a screenshot of your purchase, as they did not send a confirmation email and helpdesk took 24 hours to respond, i showed my screenshot and reception sorted it out.