I bought one few months back and i would say it's a crappy combination. The handset failed to communicate with the headset in the right way. Sometimes, it's fine but after few calls, there's hissing sound and the quality is bad. I've upgraded the handset firmware to the latest v400x but the problem still occured.
I'm not sure it's the problem of the handset or the headset. My advice is just avoid this combination.