[linux-audio-user] Echo Layla 24

Hi! Has anybody tested the Echo Layla 24? I'm searching for an external audio interface with low latency (for soft synths) and high audio quality (I'm tired of internal cards, buzzing or making stupid sounds when I'm moving the mouse or something) and of course it should support Linux. Layla catched my eye first, because you can also use it in conjunction with a laptop. That's very handy, although not that important. Any pros or contras? Or can anybody recommend another device that matches these criterias? And whatabout DSP functionality? I read a while ago that there are interfaces which come with DSP chips. Is that useful? Or are they supported only by very few programs? Regards, Christian