I got you fam.
These are made by Wolff Gunsprings, originally for INS when they were issued the Beretta 96. Earlier Berettas had a thin gauge wire trigger return spring that was prone to breakage. The TCU was a fix so you basically could never break a trigger return spring again. Beretta eventually made a thicker gauge trigger return spring that had much less breakage that was incorporated in the 92 line.
I've been using them for years mostly because changing out the trigger return spring is a PITA if you don't have a slotted tool to move the spring leg back. You will need a metal 92 trigger to use it as the polymer coated triggers are not compatible. Wolff has the reduced power, standard power, and the extra power. I would recommend getting the standard power as the reduced power makes the trigger reset kinda mushy whereas the standard does not. You can buy like five OEM trigger return springs for the price of one TCU, but it's a nice piece of mind.
tl;dr buy the standard power TCU, a metal trigger, and a D (hammer) spring for a nice trigger on a Beretta.