I was hesitant about the low cost of these isolation transformers compared to others on the market. I am running an internet streaming radio and needed several filters. I bought one hoping it would do the job, with the goal of buying as many as 12. After using the one I bought as a test on all of my connections, I turned around and bought the other 11! This works great, and it's low cost! No hesitations, I would by more in a heartbeat if needed!