I used one before I moved to my Panamax 5300. I had the 12 amp unit and needed to move to something that didn't limit current cause my new setup needed more juice.

The unit was fine for the most part, only downside was transformer hum that happened seldomly. It was filtering the bad electricity from my neighbors, my fridge, and other stuff every once in a while.

It is a massive transformer, so you do not want to plug in anything that will be current limited. I had multiple power outages (calif power crisis) during the use of my unit and never had any damage to my system.