It's not an improvement on the 6-day Paris Museum Pass: just €74. I think a former post stated that you'll be in Paris for 6-7 days? What with a Navigo Decouverte or even individual transport tickets, you won't come anywhere CLOSE to spending €189.
My husband and I shared 1 carnet of 10 tickets ( €14,90) over our 6.5 days in Paris and barely used them all but we're big walkers. We made very good use of our 6-day Museum Passes.
I'm not even seeing a 5-day Paris Pass offer on the website: they list a 4-day pass for €186, a 6-day for €219, and that's on sale. Ouch.
https://www.parispass.com/paris-pass-prices.php
You skip ticket lines with the Museum Pass as well. No one skips security-check queues with either pass, and wait times can be long at Versailles.
There are a few things the Paris Pass covers that the Museum Pass does not but we either weren't interested in them - such as the 1-day hoho bus tour - or figured we could buy separate tickets to some others, if desired, and still come in way under the price of the Paris Pass.
Essentially, the Paris Pass is a package of the Museum Pass, the Visite Travelcard zones 1-3 (does not cover transport to/from the airports or Versailles), plus some other odds and ends. Like the others, I've never seen this pass recommended as a worthwhile buy.