Tinker,
The Interarms actions were built to a price.
Compared to a genuine FN (which they are copied from) the fit and finish of internal parts is a little rough in places on some of the actions I've looked at.
That said, they seem to hold up well with serious use and seem to function well.
The 416 Taylor has achieved quite a good reputation here in Oz among those who have used the cartridge on big game.
So long as the price is right it should be a good thing.