They're good, even by today's standards. I have a pair that I still use. I think the true audiophiles have a problem with them as a reference monitor because they're amplified, because they're noise-canceling, and because they're really designed for Bluetooth use. But if you want some good Bluetooth ears for listening to music they're great.
The original Ziks were pretty heavy. Also, the battery is removable, so if you can source new cells they should last for years.