I’ve been tempted by these sims quad pickups for years now, the price is a bit of a hurdle but also as Cato mentioned, placement is as big a factor in the sound
they put out and having watched videos of them im not convinced enough to shell out on them. Maybe one day.
To briefly touch on the stealthy-ness, I believe I read some time ago that the battery was purely for the leds and can be left unconnected, it doesn’t affect the pickup sonically.