I had two C7 flashlights engraved with my own logos. It was easy to upload my own graphics files and the previews of my logos proved to be accurately rendered for size and placement on the actual flashlight. I selected the C7 for my first two tries at engraving because I already own one and am completely satisfied with its performance plus the head has an even surface for a logo (as opposed to the fluted surfaces of the heads on tactical style lights).
The two logos I created were based on the Wyoming state flag. I was concerned about the resolution of the engraving but everything turned out fine - even the thin tail of the bison on the flag. My concern was based on Fenix not providing any guidance other than file type for logo uploads. What is the ideal resolution for my files? 300DPI, 240DPI, 150DPI etc.? What are the maximum dimensions for the logo? Nobody at Fenix could tell me and nobody could put me in touch with the engravers. Additionally, Fenix has a Wyoming logo design available for engraving but the bison on it is not representative of what the animal looks like on the real flag. It looks like a pudgy baby bison with very little detail. It looks low resolution and that made me question how my logos would turn out.
The online order process did allow me to provide notes to the engravers and I asked them to let me know if my designs were suitable for engraving. My order included a printout of my notes with portions highlighted. The engravers did read what I wrote!
The engraving only took one day and the C7s arrived before the rest of my order. Uploading my own custom logos was easy and the previews were very accurate. I only wish Fenix had provided provide full specifications for the graphics files so I didn't have to guess. The files I created were 3,000 X 2,000 pixels at 300DPI and uploaded as PNGs. I had high expectations and the engraving turned out perfectly!