I think I am pretty lucky. My girlfriend got me a 7520 for Christmas, as well as a Jabra BT250.
As this is the only BT headset I have ever used, I don't have much to compare it to. However, the SLIGHT echo is bearable, IMO. You basically hear your own voice in the earpiece a fraction of a second after you are talking.
As I said, I think I will be able to handle it. The BT is pretty cool stuff.