AVE finds most of the earthquake stuff to be relatively Skookum upon teardown. I think HF tools are Hit or miss. Maybe 20% of their tools are great and and a crazy bargain, 30% are serviceable, and maybe half are craptacular.
I have been tempted to get an earthquake E-impact but I think its worth the extra money to get a tool that is better supported with more universal batteries. All of my tools are Bosch and dewalt, but I would be tempted to go Milwaukee since they have such a crazy variety of tools on their m18 platform.
https://www.youtube.com/watch?v=UkPzjV-ZaTU
https://www.youtube.com/watch?v=fmqKp6k9F-I
https://www.youtube.com/watch?v=jqWypTAG4Hw