The SL is the top of the EC90 range. It uses cutting-edge 'nanotechnology' to bind the carbon fibres more closely and create a stronger structure.
The steerer tube has a flat edge down its length to avoid notching of the steerer-tube as the stem clamp is tightened. A couple of test riders said that this fork felt very similar to the costlier Look HSC 5 and Time Millennium Stiff, so it won't disappoint the rider who is looking for comfort and stability in equal measure. Easton includes an externally adjustable spacer in place of the usual star washer, though in our experience these loosen over time. The five-year warranty is an added bonus.