Anyone Using a Factory or Add-on Manual Choke?

EDIT:Here's an alternative, instead of running any choke at all;
When the weather turns colder up here in September;
I use my dash-mounted,dial-back, advance-box to increase the idle speed, on my 750DP. But yes,when October comes, I do have to babysit it for a half a minute or so. October 11th she goes into storage as the insurance runs out.
Lotsa timing makes a really big deal. At 1400rpm, she has 14*idle+4*mechanical+up to 24*Vcan= 42* available at the normal setting. And I have the box set to a range of +8/-7 degrees additionally;making 50* possible at 1400rpm. When the Vcan drops out she loses the 24. After the initial 30 seconds, I leave the 8* from the box in, to total 14*+8*=22* at 900ish. Then I jump in and drive it. As the aluminum heads warm up, about 3 to 5 miles later, I feel the car surge ahead, and that reminds me to dial the timing back to normal.
This on a mild 360/4-gear
A long time ago, I thought I would plumb the Vcan to one of those thermo-vacuum switches, to switch the Vcan from manifold vacuum to ported vacuum, cuz that would make it automatic.A guy can get those in several different calibration points. But cheapazz me got used to twiddling the knob, and the DP is set rich enough at idle, to work with the 14*initial timing.This is another reason I only run 14* of idle timing.