I've heard a few models in their range. They have a really unique and interesting sound. I'm no reviewer so it's hard to explain. The lower models seem pretty fairly priced, the higher models get expensive but seems appropriate for what you get.
I went back and forth between them and Lampizator, ended up choosing Lampi. But I think I could have built a great system around SW1X if I had gone that route. Definitely give them a listen if you can.