Just received my Omni 4000 (sweet!) and spare 100LG along with the braided hose with moisture trap (which I forgot I ordered, so it was a nice surprise!).
From what I can see what looks like a messy solder job where the cup joins the body on the Omni, and the word "Demo" is engraved in the body where I would expect "Omni 4000".
The 100LG looks perfect except the engraving is completed mucked up, I don't care as it's basically for the parts only anyhow.
Terriffic deal no matter how you look at it!