Montporte Dungeon...previously we had been using AD&D 1e and then Blood & Treasure. Additionally, +Rob Conley DMed The Mines of Phandelver for our gaming group. So we have some time with D&D 5e under our belt.
One of the rules we hadn't used--and it is a significant one--is Attunement. Attunement is buried in the Dungeon Master's Guide at the beginning of the magic item section on pages 136 and 138. Basically, most of the more powerful magic items and many of the lesser ones can only be used by characters who have "attuned" themselves to the item during a short rest. Characters can be attuned to a maximum of three magic items at a time.
So I decided to roll out the rule, with mixed reviews from the players. Some liked the idea. Others not so much. Honestly, I am ambivalent about it myself, but I wanted to see how it would play out in actual game play. So we tried it. I am still not sure, although I have done more reading and more research on it.
Here are two very thoughtful blog posts from a couple of the guys in our Monday gaming group: