Gotta agree with Werbil; had my D50's now for just on 6 months. Many of the other lads have the Bose, which certainly are a great headset, but perform way below the D50's. Just the other day, I swapped for a Bose and was glad to have mine back at the end of the sector. Also like the fact an Ipod/phone can be plugged straight in (unfortunately doesnt have the RX cutout like Werbil mentioned)
On top of that, for the last 4 years, I have noticed many guys having to send their Bose headsets back to get repaired (cracks appear in the frame).
At the end of the day, Telex IMHO offer a superior product at a cheaper price