Actually my UM3X broke 3 times!
Once under warranty when the cable socket went loose.
Then the right case cracked. Sent it to Westone and the repair fee was like $15.
After about 8 months, the left case split in half leaving the parts dangling. Again fixed for about $20.
The W50 hasn't run-in. I have great experience with Westone and trust their design and service.
Plus my UM3X is long out of warranty and the repair cost is getting high. I love buying earphones when they first come out.
The quality of the old westone line feels better than the new ones, from the sound of it, you may want to hold out for a few weeks for the w60 if you can stretch you budget, they are much more balanced from initial reviews.