I recently tried ASC tube traps (big diameter base and smaller diameter top) and was shocked at how powerful they were in a small room. I almost returned them because they were too powerful and not for the better in my room that was fairly well dialed in.
However, I split them apart into 4 pieces (which is a nice option) and experimented with placement/rotation. Once I found the right place to put them, I'll never have a room without them. They are really great at what they do and can enhance a room more than almost any other equipment purchase except speakers.
I don't have experience with that specific GIK product, but I've tried tons of other things. I'm sure the GIK is nice. It's just hard to imagine them being better or more versatile than the ASC.
Good luck.