A better bov will help regardless of boost levels. It will be more crisp and responsive then the stock one and is way more reliable. I have seen to many pictures of our stock bpv getting tears within a few thousand miles or even less. For peace of mind it's a good upgrade to get so there is no worry about leaks there.
I noticed with mine even just doing half throttle runs my boost doesn't fluctuate like it did with the stock one. If you have the cash to do it go for it so you have peace of mind that your stock bpv isn't leaking or will get a tear.
Those are great points. Perhaps what I should have said instead was: IMO, a BOV shouldn't be your first mod (or one of your first mods). There's MUCH more bang for the buck from an intake, exhaust, etc. And let's just be honest here: the majority of the reason many people want to switch to a BOV is the sound, not so much the increased performance.
Funny aside: in the good ole days, DSM owners initially were replacing their stock BPVs left and right because they supposedly sucked. Then other turbo owners (Turbo Mopar in my case) realized that they were actually great upgrades for really cheap, especially when crushed. I was running a 1G DSM BOV on my Shelby CSX running 18psi and it held beautifully. My buddy who had a seriously built Shelby Charger bought a really expensive (at the time) TurboXS BOV and within a few weeks switched back to the DSM one he had previously because the DSM BOV was more consistent and leaked less. I'm not saying our stock BPVs are that robust (history has shown otherwise), but at the same time, I'd spend my money on other things first, personally.