Looks pretty impressive! What will it be when it is done?
Concrete was created a long time ago, yet it is still used today and if done right can last for an extremely long time.
I only worked with it making steping stones from a mold one summer several yrs back. First ones looked terrible with rocks showing and in the end they came out great and we could do them 2 - 3 times faster as well. Sort of zen working with a trowel and floating it ever so lightly to smoothen it out.