Sherri,
I've used a lot of Moda pre-cuts and never had one that was off in the cuts. And I'm pretty particular and do check every time.
If you buy precuts that are put together by a store or an online seller, it's going to vary, for sure.
Now cuts from that chain we all know about that starts with a J -- those are going to be off, by a lot, and you can count on it, so if you want a nice strip 6 inches wide, you better buy at least a 1/3 yard cut, and then spend the time straightening it.
RST