No foam in my cell.
No hydro mat and no pressure drop until the cell is DEAD empty.
if your running a roundy round car maybe or a off road race truck then yeah.
I'm not bouncing around over rocks or going around corners with almost no fuel and pushing my fuel till the last lap.
I do drive around town and race in a straight line. I have a cell with a sump at the rear.
I run -10 feed and -6 return with my fuel pressure gauge on the cowl and that needle never moves unless my pump has run dry.
If it's a saftie issue I've never had anyone mention it.
My cell is wrapped in a better cage than protects me and I have a 10 point funny car cage wrapped around me.