Despite what some will say, ps is a horrible build. There is literally no advantage to it over a hansel.
It's great. Just be sure to have tons of allies, so that nobody can attack you, because your attack BFA is so high.
If you go pure spy, have no allies, and no spy defense pots. No allies because they can be hired, and you can be hit until they are gone. And no spy defense pots, because they will keep getting burned, eg. no troops, they'll keep assassinating until you are spy zero'd.
It depends on what u want to do. If u want to piss people off then pure spy is great. No ally's no pots no gold and u will be annoying as hell. Lol