Slinky are interesting strings, having in mind they are one of rare companies who have specially made strings for detuning. I have bought many of their products, including those made for detuning and these regular strings are cheap and affordable. But If I compare them to, say, Blue Steel, I can definitely hear and feel the difference. After some time playing Slinky, strings loose their tone a bit, and coating falls off from thiner strings, which irritates me a lot, but doesn't change the sound. So in the end, they are not so good quality and they don't last long.