check out this vid of how easy the GQ-4x is to use

This is the ROM Burner I use. No trouble burning ROMs for older Bally / Stern / GTB games and newer Stern games. I used it to burn Viking ROMs and High Roller Casino ROMS - so it covers all bases and is cheap. I used to use the Willems Burner a few years ago, but it was fiddly and as Ken pointer out, was not good with 25V Eproms - so 2732A etc were hit and miss.