Feature-wise, your plan is nearly the same as T-Mobile One Plus ($5 add-on to One).
So... guessing you are paying, what, $4 in taxes and fees on that plan? So that's $85, or in that ballpark. If you snatched up One Plus, with auto-pay, its $75.
If you don't care about mobile hotspot data and don't mind the 480P video when on mobile, don't bother with the Plus add-on.
I'm on a SC plan myself, and I would switch over to One in a heartbeat, but my base plan is the 2 for $100 plan and I also tacked on 3 free lines during a few recent promos... if I convert to One, T-Mobile won't let me keep those three lines as free lines. Much sad.