I few weeks ago I broke my VT Clip-ons on my training bike. I went to the bike shop and had a choice of carbon VT clip-ons or the alum. HED S-Bends. I opted to try the S-Bends…big Booboo for me. I used them for awhile but never got to the point where they were even close to the VT Clip-ons. So, today I returned them to the LBS and traded them in for the carbon VT clip-ons. I thought I would like the nearly horional extensions. I never got them to a comfortable and powerful position like I can with the VT Clip-ons. Well, at least both my TT bikes match again.