While one would hope that Motorola's experience with telephony would give it an edge with VOIP, the USB-Bluetooth device PC850 underperforms. Perhaps that's still a little too lenient. Widcomm slapped together the PC850 using poor design and poor testing. Its weak engineering shows its flaws every time I try to connect the Bluetooth device in its USB slot.Like other users, my experience with the H500 is fine. Motorola apparently did this one right, but when combined with the PC850 all hell breaks loose. Remove, re-install, and update to the latest drivers...but to no avail. I even bought another PC850 after the first one stopped responding, thinking that this would solve the "USB device not recognized problem." Obviously, I was wrong.Verdict: the PC850 is a piece of junk.