Had a look at on while back the only down side I could see using the tools is whe you fiished you cutt you then have to place your saw AND guide some where together unless you disconnect the hose from the rail. Well I often lean my rail against a wall on site and the place my saw on my extrator so I think it just makes it a little bit of hassle.
Don't get me wrong I love the idea and think it's mint especially for when your doing a cut you which is very important not to mess up. With festool u would use clamps to secure it more, using the mafel vacuum would be quicker but also clamps won't work if your raill is in the middle of the sheet so it has some good advantages the mafel. Also the top vacuum adapter acts like a top aswell which I think is nice instead of festools little thing you screw on for the TS75.
Jmb