In reply to Eurny-Jordan:
Yes. I have Charlet Moser dual point crampons, where the front blades are horizontal. They are brilliant. Easy and quick to put on. I have used them for the past ten years or so. Have used them on everything from easy Grade 1 gullies up to Grade IV.
Last year I got Petzl Lynx crampons which are modular. You can choose whether to have them dual or mono point. The front blades are vertical. They are brilliant. On steep ice they are much easier and more efficient than dual blades because they don't mash the ice up so much. They just stick in. I have also recently used them in first ever dry tooling exercise - this wouldn't have been advisable with dual points .... can be used as a single mono point. Wouldn't be quite so inclined to use them on snowy gullies, however.