It's probably been around 10 years. I purchased them along with a Onkyo TX-84 amp and have been happy ever since.

I've never had any issues.

I haven't been able to use them for two years do to space constants, but I've just started construction on a home theatre room and I'm hoping they'll work.

Also, what do they mean by magnetically shielded, will this be an issue for me (obviously, I'm not technical)