I do not use it because I am too cheap to spend the $$ and can c/o a watch if the oil crawls away and the thing seizes up or catches on fire. Ha! If I was doing retail trade work (and getting paid!) I would probably use it to lessen the chance of comebacks. After 40 years working on this jonque mecanique, 'oil crawl' has not been much of a problem. I am extra careful cleaning and oiling balance cap/hole jewels and use 9415 on pallet stones and so far, so good. Before 9415 I used 941, 9010/20 etc.
Watches did OK for 150+ years without it so maybe I can get by.
Btw...I c/o (with new balance staff/MS/set bridge etc) an old no hack, high mileage/drowned/mistreated/blistered rlx 1575 and used 9010/20/9415 etc without epilame and it has been running over 24 hours with no flames, smoke, or heat. Ha! once more.
Blistered = damage to plating from cleaning solutions...or epilame. Ha! (details in the omega forums link below)
Epilame, Fix-O-Drop etc:
One main problem...it is expen$ive.
Imho it probably costs $15 or $20 a gallon to make. I do not know of course, but I do know how swatch/moebius prices their stuff.
It might be like 'One Dip'. 'One Dip' is nothing more than 'tetrachlororoethylene' that was $1.49 for an 18oz can of 'Pronto' brake cleaner for years...until it became a 'hazardous substance' and then 'One Dip' went from $8 a pint to $35 or more plus hazmat shipping surcharges. It is the exact same thing dry cleaners have used for years...tetrachlororoethylene aka dry-cleaning fluid/PERC.
(Imho) everything to do with watches is a Scam! of some sort...except Invicta of course.
Disclaimer: I own a couple Invictas and like them...one 'hand cranker' from the 1950s and one with a VAL/ETA 7750.
http://www.julesborel.com/products/tools-lubricating-fix-o-drop
Another problem...it can cause corrosion.
https://omegaforums.net/threads/basic-watchmaking-tips-oiling-part-4-the-escapement.87072/
http://watchmakingblog.com/2011/07/29/one-hazard-of-epilame/
https://mb.nawcc.org/threads/lubricant-fix-o-drop.301/