I was in a similar boat as you during the spring sale - have a powerful desktop, was pondering getting the deck. Decided to go for it and to be brutally honest, it's mostly a new shiny toy, not a revolution - which is absolutely fine enough.
I am excited about it, enjoy using it very much (on a long train/bus ride, on couch/in bed), but I don't use it every day, it hasn't been some miraculous revelation. However, it built a new clear division for my library: on one hand smaller, less demanding games I now save exclusively for handheld experience (thanks to this I already tried some games I probably wouldn't on PC, at least not in near future), on the other for big, graphically marvelous games still prefer a big screen.
Also, if the desktop goes unexpectedly tits up some day, it's nice to know I have an emergency solution in the form of the deck.
58 druid here as well, I love armor in this game so much. The pieces often fit together quite nicely by default and if not, you can easily transmog/recolor and get a really impresive look. That's why I haven't even checked the shop yet, what's the need? Usually in RPG games, at the beginning you look like a hobo who found a full dumpster of clothes next to a circus, only with time you get cooler looking stuff. In D4 you start cool and only get cooler. I love all my furs, staffs, totems, gloves, everything looks so well.