Bonjour Yverof,
Paris eh,that's almost English style weather!
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Yes,I do have the sliding table[you can just about see it in the video] and can highly recommend it.If I was to choose between that and the extension table the slider would win easily.It takes 2 seconds to attach and is very lightweight and accurate.My favorite Festool accessory in fact.Coupled with the MFT fence and flipstop you can quickly cut even longish multiple pieces perfectly to length.
Good luck finding a good deal.
Salutations,
Nigel.