I use the 3" version of it on my surface grinder mainly, for grinding up my lathe tools. But I have used it at times on my mill and it seems rigid enough for the size and odd occasional use on there.
I must have had mine for about 10 years and have had no problems with it. Shame it didn't have a vernier scale for the angles, but then it would have cost double the price.
The elliptical shaped foot causes me some problems trying to align it square to a known datum. But I suppose half an hours hacking on the mill will soon get a couple of straight and square side faces to it. Another one of those tuit jobs.
I wouldn't be tempted to use it as a main milling vice though, that requires a lot of low down rigidity, which this vice just doesn't have.
If used for when simply and quickly changing angles is required, as I do, then it is very good.
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