I've worn the Trion:Z Dual loop for the last 6 months, I found it to be fantastic at reducing muscle aches after a heavy workout. So when it broke last month, there was no question about what its replacement should be. However, I decided to give the Ultra loop a go instead of the dual loop, mainly because of the wider wristband I thought would be less likely to break than the two thinner bands on the dual. What a mistake, within days of wearing it I could tell the difference. It is like I'm not using one at all, my muscles ache after a workout and my sleep pattern is askew. My advice, save money and buy the dual loop