I like that it is relatively easy to get started with, using their online editor makes creating prototypes feel more intuitive than others we have used in the past (like jsFiddle).
The only downside of this framework which i can see right now would be how difficult some things are without going throught tutorial/guide etc.. It's hard at first but once you learn all its core features, writing code becomes way easier! You will need time though because there isn't any quick start guide or something similar where one could jump into coding straight away if they donno much about javascript programming world yet. If your looking just learning JS then go ahead otherwise try other frameworks such as Jquery UI - bootstrap-4 since both ampsend & jqueyui share same look n'feel :) Try to use them together so u wonna know what works best wen working withe eachother :p.