They do make quality cables, in my opinion the SP4 (and MA4 interconnects as well) is probably the sweet spot in terms of value per dollar. The lower models are fine but don't really stand out as much to me. And the higher models are great, but there's so much out there in that price range that it's tough competition.
I will say I don't care for their XLR cables, due to most of them using the same relatively basic Neutrik connectors. Those are fine for cables in the $200-300 range but if I'm paying double that I want something nicer.
Lastly, they frequently have sales, demo models, etc, so try not to pay full price if you can help it.