I fear you'll not get an answer until someone tries it. I have not, so I know nothing, but here are some things to consider:
1) It would appear to be a switcher, so there is a risk of increased noise level (background hiss). They say it has 2A output, so it should have enough current to power a few 'Factors.
2) If you try to power more than one pedal from a single supply, there is a danger of ground loops. Presumably this is why they recommend their ground loop filter. Again, don't know how well it works.
Note that damage caused by using a non-Eventide supply is not covered under warranty.
