Last monday my brother and I started putting some levels onto our necros: I got to 73 he's 72 now. Our power is laughably superior to what it was when we were 70/67 duoing.
Saturday I logged in solo and dinged 74. Ashengate pyre rank II has been in my bank for months (if not years... I've lost track) and it was worth getting that level alone. The spiders in Icefall cry when I zone in now (that is such an easy kiting camp).
We'll likely play tonight and I expect to get to 75. We're going to hold there for a bit to let him catch up some AA. I'm over 1000aa and have had almost nothing to buy 71-74 so I am looking forward to 75 giving me some better options again.
My brother is also talking about hitting some newer-than-TSS content which is a good thing as neither of us have really done any of it.