I have 2 GIK Monster Bass Traps, 2 GIK 244 panels and 2 RealTraps MicroTraps. I'm very happy with the products from both companies. I can't give a comparison on performance of the RealTraps vs. GIK since I use the GIK for low freq and RealTraps for higher freq. Even a physical comparison may not be fair given the thickness required for the lower frequencies but I will say that the RealTraps are nicer looking and packaged a little better. The brushed metal framing on the RealTraps is nice. I don't mean to imply that I have a problem with the packaging or the appearance of the GIK traps, just that if I had to compare the two on things other than performance, that would be my comment.
If the numbers on their respective sites are comparable, I believe the GIK 244 panels had better or similar low frequency absorption ro the RealTraps MiniTraps. The RealTraps MicroTraps had better high frequency absorption than the GIK 242 panels and were thinner. Since I was placing the high frequency traps more "in the room" instead of the corners and since I wanted to place one on my low 7'4" ceiling, the 1.25" thickness of the RealTraps MicroTraps (compared to the 3.5" thick GIK 242 panels) was a plus.
Subjectively I felt the GIK traps definitely improved the sound. The most noticable difference to me was tighter bass drum. I made an attempt to take measurements using Room EQ Wizard to help with the placement of the traps and possibly my sub. In some cases the traps actually "created" nulls, I assume by absorbing a reflection that was cancelling a null. I decided to just ignore the frequency response, left my sub in its original position and used a low frequency waterfall plot to choose locations for the traps that minimized the ringing. It could be that now that I have the traps positioned to reduce ringing, I should revisit my listening position and sub position, I'm not sure.