Basically the L7 model with the extended running length and width. If you really want to try out the 12 MPH capability of this machine, having an extra 9in helps.
For those serious runners who need higher speeds and more room, the L8 is worth the extra, otherwise stick with the L7 series. You can really try out the 12 MPH top speed with the extra belt room. For those who have run on a Landice for years, the L8 will not disappoint and will likely thrill you but if you are used to working out on a Precor commercial machine at your club or hotel, you will feel like something is missing and that's where the Precor models come in.