This requires the controller has high build quality. Fits quite a lot (despite other reviews), as long as you are willing to be a little creative by adding hooks, etc. I figured if I didnt like them or they werent good then I wasnt really out that much money. The length worked great with wedges for the office and it was great summer dress. I have collars similar to these that I used with my olympic weights and they work great. They were helpful but finally decided it was a driver problem. (I run 6-8 miles a few days a week and have zero problems with them staying in my ears)- Sound quality + equalizer are amazing. These are beautiful shoes, super cushy, and well made of quality materials. To me it seems as the 3100 + coprocessor was made to appease the fashion brands with the new and improved always on watch displays to make them look "prettier". Update:Nach der Reklamation wurde mit als Ersatz kostenlos ein 50m Ring zugesandt.