For the benefit of next year's crop, my BarBri simulated MBE was in the high 120s and my final scaled MBE was in the mid 160s (raw low 150s). So yeah, the BarBri stuff is way harder than the real thing. I have heard of lots of other people whose final MBE scores were much, much higher than their simulated scores.
Yeah, my barbri simulated was in the low 100s and my final MBE score was in the 150s. I think the midterm is just a ploy to convince people they need to study more.