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When using a festool tracksaw, I’ve always used a 3rd rail or other machined edge pushed up against the backs of the joining rails while I tighten the screws so I know the full length is straight. Not so easy without something straight to hand tho! I’d never trust just pushing the ends of the rails together to get a straight cut. 3M rail is definitely a good investment for sheet material.
The mafell is basically self levelling/straightening as it has a big fat joining piece that slots in and cam screws that lock it tight.
Nef
The connection on the Festool is definitely pretty good but honestly, it’s still prone to 2-3mm deflection at the centre over a 2.5m span.
Batch cutting sheet goods with the parallel guides is great and massively speeds up the breaking down process but having to check the centre for each cuts takes time.
Not anymore :)