I've used it in the past, but not in the present context.
For those of you who AREN'T familiar with Gorilla tape, here are two things you should know:
First, Gorilla tape is quite literally Duct tape on steroids.
It's stronger, stickier, waterproof and twice as thick.
Second, don't vote on my poll!
Go try it out on someone, or have it tested on yourself, then you can vote

So going back to my recent experience with Gorilla tape vs Duct tape, here are a few things my friend and I noticed.
When it came to taping ankles, wrists and arms, Gorilla tape was the clear winner.
Industrial strength Duct tape is already mighty strong, but this stuff is just unbreakable!
If you wanna make sure your buddy doesn't manage to escape his bonds, Gorilla tape is your best bet.
On the other hand, if you're planning to do a full body mummification, Duct tape would be the preferable option.
Gorilla tape is twice as thick as duct tape, meaning that for the same size roll, you get about half the amount tape.
Unless you're ready to spend a considerable amount of cash on mummifying your buddy, you're better off sticking with duct tape.
Now for the part you really wanna hear: the gagging!
I've tested both and I have to say, they're both evenly matched.
Gorilla tape is way stronger and stickier, but it's so thick that it doesn't mold as well around the mouth and face.
Duct tape loses it's grip more easily upon contact with saliva, but it's thinner and allows you to create a perfect mold around the victim's lower face, sealing the lips shut if done right.
If you're opting for a wraparound tape gag over an un-stuffed mouth, go with Duct tape.
It'll keep your friend muzzled up tighter.
On the other hand, if you're going for a mouth stuffing + a wraparound tape gag, I'd definitely go with Gorilla tape.
Since your victim's mouth'll be jam-packed (in my buddy's case I used both of my worn ankle socks), creating an extra tight molding seal around the lips isn't as important. What's important is keeping those socks in, or whatever else you're using as a gag.
Gorilla tape is real strong and sticky and it kept my buddy muzzled up with my socks for well over an hour, with no sign of wear and tear whatsoever.
Having said all this, here's my final verdict:
When it comes to taping up a person's limbs and body, I'd have to go with Gorilla tape.
The strength and stickiness it provides is just too great to ignore.
But when it comes to gagging, I'd have to go with Duct tape.
The thinness of the material actually gives Duct tape a slight edge when it comes to creating an air-tight seal around the victim's mouth and face.
All in all I feel that both are really great to have around when having fun with friends.
Using a combination of both would be the ideal, especially for the gagging.
Duct tape around the head and Gorilla tape to reinforce it all.
Both are just fantastic for anything bondage-related.
What about you? Which do you prefer out of the two?
Share your comments and experiences.