This gate is wonderful.   Very well made.  Excellent assembly and user guide instructions.  Very attractive graphite color - matches my exterior Pella window casings.  I installed this gate OUTSIDE between a brick walled entrance way to my front patio outside my front door to contain my two small dogs.  I took the risk installing it on my patio, though the gate is not intended for exterior use.  
It was been two months and the gate shows no sign of rust and it continues to function perfectly. Though I will not go so far as to recommend this gate for exterior use, it is working well for me.   I plan to heavily treat the mechanism with machine oil several times over the winter to protect it from the Maryland elements.  I used four  1/4" thick black foam pads between the side contacts and my brick wall to stabilize the gate and it works perfectly.