Amplitude is a great product. We tested alot of similar products and Amplitude was by far the best. The only negative I have found is their pricing which is free up to quite a generous level to be honest but then it suddenly becomes really expensive.
I agree, it quickly becomes exorbitant. I used to manage a product used to record data points in fields - millions of datapoints a day and this cost us just too much money in my opinion compared to what we really learned from Amplitude.
I wish they would have event volume pricing option rather than just MTU, same with Mix+Segment. Very inflexible if the site you run has lots of infrequent users.
