I have a Samick Fairlane 6-string and have played the Cobra 4-string. I think both are great instruments, but your mileage may vary.
When I was comparing 6-strings, it was between the Fairlane and a Peavey Fury. Both were similarly priced (the Fury was $374 new and the Fairlane was $300 used) and looked sharp with their quilt maple tops. The Fury left me with a very good feeling (looked, felt, and sounded like a more expensive bass; nice thin neck too), but the narrower string spacing on the Fairlane just absolutely melted in my hands. I had to have that bass. The electronics are pretty quiet and while there aren't tone shaping capabilities out the wazoo, the sounds the bass does have are all quite nice. Balances well too and the 6-bolt neck joint's pretty tight.
GRIPES: The stock GHS Boomers strings aren't very good, but I'm digging the Ken Smith Burners I put on it. Also, the knob layout is unintuitive. Thirdly, there is no separate/ easy access battery compartment. You have to unscrew the back panel to change the battery and there aren't any threaded brass inserts, so you may get stripped out screw holes. So you're kinda screwed if a battery dies during a gig.
As for the Cobra- I only played one briefly in a music store, but I liked it. The bass had a nice look to it, the neck-through design gave smooth upper-fret access, and the sounds I coaxed out of it were quite good. While the bass may have more of a 'metal' look, the tones I got out of it were usable in most any usable context outside of metal. The neck was finished so it wasn't super fast and while it was slim, it was too rounded for my tastes. Also, given how close the neck pickup is to the neck, there isn't much room for slapping and popping if you play those kinds of styles.