SPL Parts Rear Toe Links (eccentric lock-out) - anyone tested these?

I've heard varying stories about the rear toe being out of alignment on our cars from the factory, along with BMWs known to have soft rear bushings (need subframe bushing kits).

I happened to find the SPL parts, which may help with a lowered car (I have H&R Springs), but wondering if anyone has tested it out to correct & lock-out the alignment. Would these be a good fit for my set-up, or overkill for the occasional canyon carver?