Apart from I can see Skype for Business will start to eat into the big vendors (Cisco, Mitel, Avaya) rather poor UC offerings. As it's a Microsoft product it'll have proper integration with exchange / outlook as opposed to the poor products from the above three that struggle on thin clients and the Lumia phone range is at Microsoft's disposal for the 'one handset does all' solution.
Having had to suffer Lync and subsequently Skype for Business on a daily basis for work (a cost cutting measure... ...at a telephone company!) and also a user of Cisco Communicator softphone (and deskphone) with a UCS backend, believe me Cisco have absolutely nothing to worry about (ignoring licencing costs).
The Cisco Communicator softphone is just like using any other phone, apart from being constrained by a wired connection to a laptop. Skype for Business demonstrates how badly VoIP can be done - dropout, lots of digital noises, delayed speech, everyone talking over everyone on conf calls due to latency. Its hopeless. And that's with a proper "Skype optimised" headset, something not needed with proper VoIP systems.
Skype for Business also has video conferencing facilities built in, but again, hopeless in comparison to the various variations of WebEx. Screen updates several seconds behind, sometimes even a minute if the connection isn't fast, making presenting unproductively embarrassing.
Can you guess I'm not a fan
