I have tried 4 different classic inserts in the T-Loc, none fitted.
I do like the handle on the T-Loc. I don't like that the systainers themselves aren't square anymore. And I don't like the twisting lock mechanism. It's uncomfortable and it strains my hand.
Btw, a Festool dealer close to me told me that the patent on the classic systainer was expired so that everybody now could make them. He said that this was the reason Festool decided to update the systainer to a model they could patent again. Is this true?