I ordered this pedal for the Tsl 601 I've had for years now, because the original footswitch had gone missing during gear storage/transport with the band I was playing in. And now I'm actually glad the other one got lost, since it had this weird tendency to mostly switch properly but sometimes it would switch to the wrong channel.
But this new one is so much better. It feels more solid. The original one felt a bit lighter, the pedal itself and the switches made a hollow clunking noise every time I stomped on it. This one doesn't do that. You step on it, it gives a quiet click and does its job, switching back and forth through three channels without any problems.