[BioRage]

Depends on your play style and preferences, I suppose.

Some people use for RDS and Scopes. Some just use their iron sights, since it's airsoft.

Some people go as far as getting real steel T1's and EoTechs.

I had a fake EoTech and a G&P Aimpoint M2 Rep and was not a fan of either, I tried a friends replica T1 and enjoyed it quite a lot. Currently I run iron sights, but debating on budgeting for a T1 style replica.

Edit:

If you get a chance, I would check out some local people's setup or friends optics to get a real feel for it. Everyone is different and some prefer x over y and z style of RDS/Scopes.