I just replaced my chain with a KMC e1-ept with the EcoProteQ coating and repacked the clutch on the derailleur which made gear shifting much crisper. I had an annoying squeak and think it was the clutch all along and it had no grease in it so if you have a Shimano derailleur I recommend watching a youtube video and repacking it. It was fairly simple and you do not have to disassemble the whole thing like some videos show but just repack the clutch and give the whole unit a good cleaning and lube and you will be good to go. I also went with 208 rotors front and rear which makes stopping power much improved over stock. You will have to change out the adapters and I bought everything from Jenson USA.
Other than that all is well with my 2018 HAL eBoost PRO and I am ready for some riding.