A truly excellent expansion that unfortunately has some inconsistent difficulty problems (in my opinion, at least) and some really bad performance problems in too many places.
On a higher end PC (RTX 3060, 8gb vram, 16 gb DDR4 ram at 3000 mhz, i7 9700k), my frames would dip (and sometimes stay) at the mid to high 40s or sometimes even high 30s. Putting my settings to low did help some, but not as much as I believe it should. This amount of lag is not something that should be happening, especially when in some of the dungeons that are rather empty, I am still lagging a bunch.
I find the difficulty to be inconsistent, but I will say I do not think it is as hard as many people say it is. Don't get me wrong, this dlc is HARD. Scaling works much differently and leveling yourself up a ton does not help as much as it did in the base game. But only the final boss is an encounter that I believe is genuinely unfair because of the difficulty. Everything else, to me, is fine.
All in all, 8/10. If a performance patch comes out that fixes up many of the areas that bring me a lot of lag, it is easily a 9/10. Worth a purchase either now or later.

All I will say is, if a 15$ game has way more content than most 60$ games, and you beg to spend more money on said 15$ game, it's a GOOD game. 60 hours in, 112% completion, and there's still stuff for me to do. Buy this game, nothing more, nothing less.