A:AnswerIf by "soft" you mean comfortable then, yes. Low-profile, whisper-quiet keys help make typing IMs, emails and anything else nice and easy. If you mean the actual material used then, no.
A:AnswerThe description on the page is wrong and says it comes with a unifying receiver. The old MK320 did in fact come with one, and I have dozens of them to prove it. Unfortunately Logitech at some point decided to put a nano receiver in the MK320 now, so you can't rebind to other devices. In order to get the unifying receiver you'll need to order the MK335, which is the exact same thing but much more expensive. So yeah, they got greedy and now charge you much more money for the exact same product.
A:AnswerI run two different computer systems at the same time side by side and have no conflicts with either system. Both have Logitech wireless keyboards and mouse.