All sear jigs work equally well. Some are fancy, some are simple like the Ed Brown, but they all do exactly the same thing. I use the Ed Brown and it's simple and effective.
No sear jig is usable until you understand the 1911 sear/hammer/spring relationship. I say this because the quality of the trigger job depends not just on a crisp, light let-off, but on proportionally weighted take-up, crisp let-off, and smooth reset. The adjustment of the spring legs is exactly as important as the proper engagement of the hammer and sear.
You will need, in addition to the sear jig, the appropriate stone, the Brownell's 080-721-604WB.
The engagement of the hammer and sear are easily checked by using the pins from your gun to install the hammer and sear on the right side of your gun. This is ideal since the spacing between the pinholes has some tolerance. Don't adjust your sear spring until you have tested the gun with the stoned hammer and sear, since very often the stoning process will take several pounds off the trigger. Do not go to a lighter mainspring in an attempt to lighten the trigger, it doesn't do the right thing. You may go to a lighter mainspring if you will be using the gun exclusively for range work.
A factory hammer will often benefit from the simple application of the stone to square up the hooks. Factory hooks are usually almost exactly 90 degrees anyway, so you might as well make them a smooth and perfect 90 degrees. The stone will leave a mirror finish. When you are stoning the "relief angle" on the sear, proceed slowly and test in the gun. The relief angle does not need to be very deep to do it's job, and going too far can produce an unsafe sear.
The EGW sear is perfect as it comes from EGW, and requires no touch up at all. Mated with an EGW hammer, you would be hard put to improve them beyond the "out of the box" feel with a properly adjusted spring. The Colt spring is the best one made. The EGW spring is the Colt spring. The Cylinder and Slide "reduced" spring is actually the standard Colt spring.
If you wind up with a trigger that feels creepy after stoning, bend the sear spring to increase tension, and the creep will go away. Crisper and slightly heavier feels much better than lighter and creepy.