I own my delta for a half year now. I still love it!
This are my upgrades so far:
-Noctua fan for main board.
-Glass plate with “renkforce Haftfolie 30x30 cm”
-E3D nozzle, replacement because Wood filament (not Velleman!) worn it out to 1.3 mm.
-E3D silicon socks for the hot end.
-Capricorn PTFE tube
-Sleds and bushings from Dr_Vegetables thread.
-And this one.
I think I can fill up this glass completely!