I have run the MSD 6AL for 5 years in my Camaro without any problems, but when the Digital 6 was called to my attention, I had to make the swap.
The Digital 6 box is the most power full digital ignition system of its kind and draws much less amperage than the alternatives. It also has two rev limiters, one for staging and one for high rpm limiting. The great thing about these limiters, is that they are adjusted by a dial rather than swapping chips marked with a specific rpm. This is great for experimenting with shift points. If you are using nitrous this is a great piece since it has a built in retard function for single stage nitrous use. Like all of MSD’s products, it is very easy to incorporate other electronic devices such as shift light, timing controllers, tachometers, and whatever else you may need on your street or race car.
The case of the control box is a slightly different shape than the 6AL and uses a different bolt pattern. If you do not wish to drill new holes in your firewall, or wherever it is you had the box mounted, you can make a simple bracket to relocate it as I did.
I run my ignition box in the glove box of my car, so I noticed right away that there is reduced noise, as the 6AL made a slight electrical hum. I strongly recommend this unit to anyone with a street car who wants race performance!