Even a quality BOV will leak. The ones that leak LESS have a double chamber/piston design, like the HKS SSQV ones, but there are so many fakes that the chances of getting a real one are very slim. And they are expensive. If it is worth less than 200$ it is a fake. If it is worth more ... well it can be a fake too.
Recirculating is fine really, even with a leaky BOV. It does not make that woosh sound, but then people get so surprised NOT to hear that sound when getting left in the dust that you will grin a lot
