I purchased a music bar a few months ago to use in me dedicated home theater and music system.
It did lower the noise floor and made the whole system more quiet, increasing the dynamic range.
I plugged my DVD/CD/SSP/TV into this which in turn run into a PS Audio P1200, then to a PS Audio UO, and then to an FIM outlet and to the wall. Even with all this power conditioning the music bar made a significant and worthwhile improvement. This is especially true given its reasonable price.
Troy