When selecting an ACS vendor, it’s very important to understand where it came from and who is maintaining the solution. Is it open-source? Was it licensed? Who wrote it? These are all questions you should ask yourself to ensure support continuity.
The ACS standard is still evolving, and will require changes and updates in the future. If your ACS vendor is not the developer, you could be disappointed somewhere down the road. If something malfunctions, you must be able to determine whether the failure lies with the ACS or the device. I have seen ACS vendors point the blame at device vendors, when in fact there was a problem with the ACS. Again, this goes back to knowing who developed the software and whether real support is available. Remember, a free product is not always free in the long-run, and if something sounds too good to be true, it probably is.