We purchased 20 of these for our staff. 1 was buzzing from a malfunctioning transformer. Tripplite replaced it free of charge after a short troubleshooting session with their Tech support(American Tech). We have had one outage and they all performed flawlessly. Looking to purchase more in the future.
This is the third product I have purchased. The first 2 have been in use for nearly 8 years. Excellent reliability and great customer service if needed. Quality products at a great price!