Not necessarily, just because I can't tell any real difference doesn't mean there isn't or couldn't be one. Maybe I'm getting "cleaner" power than you. Maybe the power in your place needs to be filtered. Maybe there is a difference and maybe it is imagined. I really can't say. All I can tell you is that in my particular case it didn't seem to make any noticeable difference that I could see. The reviewer in that article, who is respected here, said that in his case it made somewhat of a difference. At the price I found my unit at, $120 w/ 1yr warranty, it fills my needs, looks cool, is within my budget, and leaves me happy regardless of whether or not my stuff needed filtering.
Jack