So i just used ripper jaguar and this is my observation. It is great with my playstyle, which means, short map involving a mix of units from every hq lvl, it does exactly wat base jaguar does, just more fire power and actually kills mass infantry even better than wolverine.
So most optimum time of use: early to mid game combined with mass early hq units
Late game against mass zeus, torrents + t3 hero abilities, they become glass cannons
So best late game comp: 2 assault factories with mass armadillos, jags should act like mammoths, firing from a range while u ram enemy formation with chameleon, mass armadillos and a bison
