Been running my 2781 for almost 1 year now, purchased July 2019. I'm airing my rig anywhere from 8-42psi at least 2x month, occasionally multiple times a week, still running strong and apart from setup times I think the actual airing time can't be much less than my friend who uses the ARB dual with a 1gal air tank, but he only goes to 32-35 from as low as 8.
Recently I cut the rubber hose and added a US coupling because I got sick of the screw on connection, never used the guage, always used TPMS. The connection at the end of the rubber hose does get hot, but the compressor always seems cool enough to put back in the bag. I'm looking at mounting it to the C4 battery tray on the passenger side of the engine compartment soon.
In April, I opened it up and added some silicon grease to the piston rings and cleared it out. Didn't have any reason to open it other than attempting at prolonging the life of the unit, performed perfectly, but another forum was suggesting that it increased speed and made it quieter. There was some black stuff in there that almost looked like parts of the filter, but the filter didn't look like it was missing any foam. Maybe got a little quieter, but didn't seem to make any significant difference in heat or speed.
The significant difference between this and the ARB in my opinion comes down to price and size, I think speed difference is negligible but that matters to some.