Cheap, cool syringe thing, safe on all markers and o-rings
Not good for o-rings, builds up in spots, turns o-rings yellow
I read the reviews and got this for my 98 Custom Pro. At first I thought it was great, I'd never used anything else. Anyway, I oiled my gun for what I thought was going to be the last time, two months later, I opened up my gun to see a lot of sludgy, slimey yellow oil. It all bunched up under my power tube and all of the orings were dark yellow and weren't very stretchy. I have since gotten TechT Gun Sav for my new DP G3, and I will have a review up for that after I use it a few times.
Good for your low-end guns, your spyders, tippmanns. Not good for the weekend warrior who goes twice a year, all of the oil will be dried up and sludgy. Not for fast guns. Still overall, pretty good, fairly slick, Better than nothing.
6- Above average, serves purpose