I could try one about two months ago, for about a couple of minutes... Yes, not much, but it felt really good. I can't compare it with anything, because that's the only linear switch I've tried, sorry. But I can tell you it was very smooth and really silent. I prefer clicky switches, but after trying that keyboard I'm thinking to give some linears a try.
About the keyboard, it wasn't connected to a computer, so I can't tell you about the LEDs. But I felt it was a good keyboard, it had a good weight, it was nicely built, and even I'm not a fan of gaming keyboards, I liked it.