I made a huge post on this over a BYOAC and here I think when they first came out. They are okay.. Yes just okay. The "two" harness is missing the -5 line which causes problems with some games, the soldering is total shit, you should verify voltages on every line before connecting to a real pcb since I have found some that had +12 and -5 connected on the edge connector!!
The remotes are nice, they only work about 2 feet from the machine if the boards are installed inside. Some games have video issues using these. I have found diodes installed backwards causing the video and button issues. The newer ones that use surface mount parts are better with that problem.
Your pretty much taking your chances with these. I can tell you that if you want to use them with the Mortal Kombat or Killer Instinct boards then you need to get the -5 installed and add a 1n4004(or equivilant) diode to it.
Older PCBs dont seem to have issues though and work well. I have always been able to mod them to work well though with any pcb.
The 6-in-1 switchers that are made from the same company are even worse with these problems.