They are premium built phones. Hardware is very good with one flaw : the cord is not detachable/replacable.
The software is OK and has most basic features and some advanced features.
POS:
* Phones can be configured, rebooted and upgraded very easily through the cloudcontroller. So this can be done even remotely.
* software is being heavily under construction with updates and patches almost bi-weekly
* builtin webcam
* builtin intercom
* builtin bluetooth(!) on pro and executive (for cheap cordless headsets!)
* builtin wifi on pro and executive
* Google app market
* endless use cases from angry birds to domotica control
* PoE or micro usb powered (battery pack and wifi, anyone?)
CONS:
* phone app is a bit basic, but ok since a few months
* primairy phone app cannot be easily replaced
* non-replacable cord or handset
* no function yet for dual ringtone (internal/external call)
* no full CTI support yet, but can be emulated. However, even Cisco SPA's don't have real CTI...