I have one at work, and it's great. It's a mechanical keyboard, but it's low profile, low travel, and almost silent. I got the one with the low profile brown tactile switches. I highly recommend it.
I've never used the Logitech K860, so I don't have any point of comparison.
But on just comparing the specs, I can see the main difference is the Logitech is a membrane keyboard, and the perixx is a mechanical keyboard. If that matters to you (it does for me) then the perixx is the clearly better board.