Yeah... I just bought the nirvana ion ( I like nord buds 2r and oppo air. But, oppo/oneplus/others tweak TWS for their own phones - providing poor performance with any other brand's phones .)
Btw, Boat had sent this model to content creators , before big billion day offer. And got a big push on sales.
This guy has some cons for Nirvana ion : https://youtu.be/dsiaTODzbBc