I Have had the Gigabyte Aorus Z390 extreme only a week, with a 9900K and its a stonking board, this is my first gigabyte board as I have always been an Asus Fan. what made me switch was an Asus z390 extreme DOA board.
after reading about the Asus QC being off these days and the RMA situation with Asus I thought I would give gigabyte a go and very pleased I did, yes the bios is different and maybe not as well laid out as the Asus boards but its all there and after a while
like most things you get used to it.
what an awesome board, put in the 9900K with Raystorm water block along with 32g of G.skill Trident Z F4-3600 c16 then flashed the latest bios F5G, and 5G straight off all cores with 1T on the ram.
Really impressed with the Aorus Z390 extreme and 100% rock solid stable in everything. Also lucked out with the CPU all cores with in 3c of each other.