While that fed agency did use millions of rounds of that load, it was hard on their guns.
They eventually decided that an even better load would use a lighter weight, in the 135gr range, but one loaded to a lesser velocity than what is typically favored by internet firearms enthusiasts.
A Winchester LE rep tole me some years ago that the 155gr load used by Customs was the primary reason they developed their standard 155gr JHP Ranger load, so they could compete for a piece of that fed pie. Then, several years later it turns out they got the contract for the new & improved lightweight 135gr .40 load the agency came to favor better.
Stay tuned for the "Next Big Thing" in that agency's lightweight .40 loads somewhere down the road ...
There's been some amount of this bullet weight .40 load being dumped on the commercial market in recent years.
I remember when the 155gr load was first starting to become popular. I tired some Federal and Winchester (STHP version), as well as a couple of the lighter loads made by a couple of other makers. I never cared for the increased muzzle blast/flash or the increased felt recoil, myself.