Perfect ballast supplement
I have a 2002 Mastercraft X-Star with the stock hard tanks in the back (300lb/ea) and upgraded ski locker sack (400lb) on switches. We bought two sets of these sacks to keep full 100% of the time in the boat. We put two in the back and they stay full with hose water for the entire summer. We have two more that we use for the bow depending on how many people are on the boat. If no one we use two up there and if we have 4-5 folks we just use one, which fits perfectly in the walkway of the bow (when using two we stack them). THE WAKE IS PERFECT with this setup, stock ballast completely full and four people. As we add people to the boat we empty ballast and therefore don't have to worry about getting fat-sack water in the boat. This should work on any 205V X-Star, X1, X2.
Side note - I gave four stars on quality based on the fact that the connection ports for these types of sacks aren't perfect. When filling it doesn't take much to accidentally knock the hose off and get water squirting from both the sack and the fill device. Just have to be careful.