Hard tanks vs. Fat sacks (in an 03 X-Star)

My family just bought a 2003 X-Star (New model) and we're looking to install some extra ballast in the boat. We are trying to decide between hard tanks and fat sacks. We want the system to be 100% automated, so that when it's full, the water will be pumped out the side of the boat.

I'm looking at the Launch Pad 350 sacks. Will the fittings hold, so that once it is full the water will be pumped out of the sac?

Any opinions on hard vs. soft would be great.

Also, if anyone has a 03-05 X-Star, what ballast are you running?

Thanks

Kent