I own it since Bedrock Beta (which was more like an alpha) and have played the full release.
I say, wait a little bit. While the game itself is very entertaining and fun (all the rooms, creatures, spells fit perfectly together), the game is in its current state very bugged. That happened because the developers locked the campaign away until full elease so alpha players won't have the game already finished before it came out. However this comes side to side with some serious bugs. For some they are more serious as for others. Some people report crashes, other only AI problems. I noticed some lag when the dungeon core is attackes. The developers are currently working day and night to solve all issues but with each hotfix they find new bugs.
It will take a while to rule this all out and you would do best to wait until the worst is gone.
But when they are mostly finished you should check the game out, it is really beautiful. Feels exactly like the old DK games with some own ideas.
If you ourchase in the first month you will also get the first DLC for free which will include a side campaign and some other stuff.
