This is a case of: If you’re happy with your machine as it is now, you don’t need to spend more money.
The only places where the extra rigidity would realistically matter would:
- Your machine is on a particularly flimsy benchtop and you want a little extra insurance that the bed won’t sag.
- and/or you work with really large/heavy workpieces- think thick hardwood slabs
If you’re looking for a couple thousandths of an inch better consistency in the depth of cuts in these extreme scenarios, this can get you that. But again, if you don’t think you have any problems currently, and potential applications like vertical workholding don’t interest you, then you probably don’t need this (as much as I should be encouraging you to part ways with your money).