Going to have to agree with Linekin.
Luck will affect your character directly. There will be times that you see that your luck had a direct effect on a roll , even when you don't know you were rolling skillchecks. I personally love seeing these little notifications.
You will also have times where a GM asks you wether you want have your @luck on or not. You won't know what stats or skills they are rolling, but i'm always more than glad to have my luck on for those times.
You can turn your luck on and off. This feels counter intuitive. This has two reasons :
First of all is to allow players to be fair to eachother when playing games agianst eachother. If i'm not mistaken , certain ingame activities take luck into effect.
Second is that you can use your luck on ANY roll. I've had times where i used luck to log into the grid. I'm certain you can't really fail logging into the grid. i'm also certain theres a skillcheck there.
I've had times where i emptied my whole luckpool driving from one place to another. Apparantly theres a check i fail every time. I also have never noticed a single negative effect of failing that check.
TLDR : Luck is a great stat to have. We've had characters with their whole concept being that they were Lucky. I'd suggest having some other talents as well though.