Don't even care for a little of it pre contest. Often times it either makes the muscle look odd or the injection site looks like bee stings. As a judge I would count that against the user if it is obvious
they're kinda like the kids in school we all knew that wore eyeliner and all black clothing and blue or purple hair...they didn't care what kinda of reaction they got as long as people noticed them it made them feel something
All the guys I have seen that have used synthol look bad real bad but used correctly I don't see an issue.i look at it like this if yor got a 19 inch arm and you use a little in the bis and tris get your arm to 20 wouldn't look at place.im not a fan of it but if your competing well it does help bring up lagging body parts
Some of the guys in the above pics look like walking infections! Look at the discoloration in the arms. First off, you look like an ass clown! Second, you can't tell me there's not an infection festering in there! Guys like this give us a bad name!
Using a small amount of SEO before a show to bring up a lagging body part and increase symmetry is a reasonable application for SEO. Using SEO in exchange for lifting is ridiculous.