Ten months after purchase, my Milanese Loop has corroded at the magnet/rubberized end to the point that it fell apart.
I purchased it separately from my watch so there is no warranty.
After contacting Apple Support I was told my only option was to purchase a new one.
Purchased my Milanese Loop at the end of January 2017.
The first week of November 2017 I noticed the band slipping resulting in a too loose feel.
Upon close observation, it was revealed that a corrosion bubble that developed inside by the magnet grew to push the panel seal out ahead of the rubber ring causing the ring to slip.
While I'm a healthy active middle-aged man, my watchband has never been subjected to swimming pools, baths, nor showers.
I have worn it to the gym, but my perspiration is not excessive.
I wear it every day, which can include days of yard work or home repair projects on the weekends.
This is an elegant watchband that is very comfortable especially for a metal band, which are two of the several reasons why I purchased it.
At the same time, the build standard for my particular watchband, which has not lasted 10 months, is less than what I've come to expect from Apple products in my 30 years as a loyal customer.
Mine may be an anomaly, so weigh this as you see fit.