Touchup Paint Pen?? Anyone used one?

Ordered a qrt of paint and a pen from automotive touchup. Anyone used any kind of touch up like this? Any tips? I have a pretty nasty scratch thats down to the primer that I am kinda afraid to try touching up. I figure it cant make it worse but Id like to touch it up as best I can. Any tips would be appreciated:thankyou2:

Get a pint of paint and a small touch up brush from your local body shop.

My experience with paint pens have been nothing but horrible.

yea im kinda thinking not using it. i got a qrt of paint with the same order to get a panel re painted so i will prob just use that then. I just have a weird feeling about using a marker on my truck lol cant be very good paint :/