This is the equivalent of having the previous 50GB base plan and going over by $50 worth of data (an additional 50GB). If you were routinely going 50GB over the 50GB plan, I'd suggest that maybe a 50GB plan wasn't the right plan for you. Under the old plan, 100GB of data would have cost $100. Residential unlimited is $120, so for most users this would seem like an improvement.

That's the thing, we don't regularly go over 50Gb. Probably won't go over 100Gb, either. But if we do, it's either slow speeds, or pay $165/month for unlimited roam every single month we use it, versus paying a little extra for the few times we go over.