I have new Fischer Vacuum boots with lace-up liners. With my previous injected liners, I was warned to avoid excessive insertion/extraction of the liner with the shell to prevent wear and tear on the liner due to rubbing on any rough interior surfaces inside the shell.
I have seen other owners of Fischer lace-up liners installing their liners on their feet outside the shell, tightening up the laces, and then inserting the foot and liner as one into the shell. My ski store told me that this offers racers the best fit possible.
To me the down side of this approach is that there are many places where the liner is exposed to rough edges while inserting and extracting.
As well, once the buckles are finally closed, the laces may go slack because the buckles exert a much greater compression on the feet than the laces could possibly do when they are tightened in advance by hand.
I do find that sliding my foot into a liner that is already in the shell is a tight squeeze and I can imagine that it may be easier to first install the liner on the foot in total comfort and then force the foot filled liner into the shell.
Please be reminded that Fischer has gone to the trouble to install pull straps on the liner tops to facilitate frequent removal.
Any thoughts on the advantages of having laces (whether they are tightly tied before or after the liner is in the shell) and whether it is best to leave the liner permanently in the shell?