Is the strength trainer worth it?

I'm trying Whoop again as a replacement for my Oura. This is my first time using the strength trainer. I did the same upper body strength training workout twice over the past week. Weights were heavier on the second, yet I got a strain score of 7.8 on the first and 0.6 on the second. Is this accurate for anybody, and is it worth using? I track my workouts on another app, so I'd rather not bother using the strength trainer on Whoop in conjunction if it's not going to give me a more accurate strain score when compared to just recording as a generic "Weight Training" workout.