Hello Emilio_rofl
In my (personal) opinion, Glacier3000 is not worth a visit for a first timer to Switzerland.
There are indeed other mountain excursions which are less costly and do offer a better experience. Other community users may think differently.
However, we never recommend purchasing mountain excursion tickets in advance. The weather in Switzerlabd is not predictable for more than two days out.
True, you may save a few Swiss francs by purchasing early, but what if the weather is not your friend on that day and you will end up in the clouds? It will be the most expensive experience to see nothing.
If we had known your entire itinerary, we could have made other suggestions.
Kind regards,
Roland