I have just received and installed (very easy to do) the metal bracelet on my U1. I have to say that I agree with Tim in that the metal bracelet is a perfect fit to the U-series and very comfortable to wear. I also have a DiModell waterproof leather strap with red stitching and Sinn deployant and of course the orginal issue Sinn rubber strap with large push button deployant.
I rank them this way for style and comfort:
1. Metal Bracelet.
2. DiModell Leather strap with Sinn deployant.
3. Original rubber strap with large deployant.
I wonder what others thoughts are on the U-series bracelet and strap options and what type is prefered the most.