I tried a pair of my friends a few months ago, loved them. I have sprenger bow balance but didnt want to get they ruined at work so have bought myself a pair of HY compositi stirrups for £20! Ok they are not sprengers but i done a pretty hairy 2 hour hack in them when i tried them and didnt get sore knees or ankles. Does anyone else use them? I start back at work on Monday after 3 months off, im really looking forward to it but I'm awaiting the John Wayne style walk ill no doubt have the first week also looming forward to testing these out more.