I ran a MSD Digital 6AL Ignition Control unit (part number 6425) with a MSD HVC Ignition Coil part number 8252 in my '89 Caprice with a 406 small block for years. I went to the MSD as the original digital ignition box I bough from Malory (Crane Fireball ignition box) never worked correctly. Had the MSD unit mounted on the top of the radiator core support behind the grill so it stayed dry and cool.
I ran a MSD 7AL-3 ignition box (part number 7330) in my '85 Impala with a MSD Blaster MSD Pro Power HVC Coils 8251, firing a high compression 582 BBC. Never had a lick of problems other than melting a few plug wires (MSD 8.5mm Super Conductor Spark Plug Wire), and that ignition box is over twenty years old.
Both of those cars were crushed and the motor and tranny pulled over seven years ago and I ran them for about ten years before that so I can not address reliability of new products (I just today discovered that MSD belongs to Holley now). When I bought them they were made in Texas by the same company that perfected a CD ignition boxes to work with Smog era cars (lean burn).