I <3 my Spyder Electra 08, So i disagree with the "anti spyder" comments.
They have come on leaps and bounds and now are becoming a reliable marker.
Ive seen mates with Invert minis, Pmrs, slgs, Ions and i wouldnt personally favour any of them.
But yeah, i agree with anti-Co2, using that is gunna mess up your gun, electric guns shoot far to quick that will just freeze /damage the insides.