Hi Chris,
Should explain that I've been veggie since the 70's, but when I was a student and ate meat - then a pressure cooker was a great way to boil or stew the more robust cuts of meat, together with veg, in a sensible time.
So if you like robust meals in the winter - beef in beer, gammon and real pease pudding, hot pot, and that sort of thing - then a pressure cooker is great.
If all you want from it is to cook your veggies, then it won't save a significant amount of time - because a good part of the total cooking time is heating the water up from cold to boiling.
And cooking tender veggies in a pressure cooker is quite difficult - you can't take the lid off to see if things are done as you like (although it is quite exciting for a few seconds) - so a bit of experimentation is needed.
Get a book, understand the safety aspects, and try a few robust meals at home.
Robert