The VBS works very differenly from more traditional power supplies in an effort to provide battery-like power (maintains DC power if memory serves), which is I think quite a bit different from more traditional power supplies. I had the opportunity to try the DAC 3.0 in my system both with and without VBS. I was skeptical about how much of an improvement I'd hear, but the improvements were not at all subtle (as you would hope for the price). I can't speak to how other power supplies would work with a BC DAC, but VBS was designed to work specifically for these products by BC and are fairly unique so it doesn't seem likely outside companies would do better. You might spend less, but you may very well get less. Given what I heard I'm saving up my sheckles for a 3.5VBS. For whatever it's worth, and best of luck.
