Has anyone had or does anyone keep the cameleon shrimp?

I bought one for my daughters tank and it was quite small but the interesting thing that caught her eye was it had long pincers.

The next morning after putting it in her tank I was greeted with sone half corpses which were her black mollie fry. I then put in one of my tanks in my garage and now, a few months later, the thing is three times its original size an looks quite scarey

I have read up on it and its carniverous (experienced first hand) and was wondering if anyone had kept them and what their experiences were