I have the Z1 front arms. the only downside is that you have to take the wheel off to adjust the alignment, which ends up costing a little more. Other than that, my alignment specs have not deviated significantly in between appointments, so they are at least reliable. I would recommend SPL if you're going to change alignment settings often though, as the cost comparison will eventually favor the SPLs down the line.
I have SPL rear camber arms with the toe bolts. They work as expected.
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