I've tried a few. They're decent knives. Like a Wusthof or Henckles. Could do better, could do worse. I wasn't particularly fond of the handle, but that's more of a personal preference, than something being wrong with them.
I don't think about going vegan. I have started going much heavier on the vegetables though. Basically switched regular American portions. Lots of vegetables, some meat and grain/starch.
Sucked at first. But used to it now and feel much better.
Need is relative. Depending on what you want to do, would depend on what you "need".
Knife repairs? Polishing? High wear resistant steels?
Each of those requires different stones with different qualities.