I had the opportunity to use the Quick Burst igniters recently. I have tons of praise and one complaint. I'm not sure what the after market opportunity will be for igniters at present since Aerotech now makes and supplies a reliably igniter with each motor. For experimenters, folks with NAR certified Kosdon motors, Ellis Mountain, RATT Works, etc, these are very nice igniters.

Fat Boy igniters:
Excellent product. Only complaint is that the leads are too short (14"!) for many motors. I used the two samples I had to a J350 and and L1120. The J350 came up to pressure instantly. The L1120 is one grain shy of an M1315. This is a big motor and there are a lot of people trying a lot of stuff to light these big motors reliably. I used a single, unaugmented Fat Boy. I had to add about 24" of wire to make it work, however, the manufacturer assures me that longer leads are no problem and if you prefer 36" leads, you can get them that way. When the button was pushed there was a moment of yellow flame from the nozzle, and then the motor roared to life. It sure seemed like the motor developed full thrust right off the bat. With big, heavy M projects, having all the grains light at once is important and in my test, it sure seemed like the propellant in the Fat Boy heated all the grains evenly and quickly and that the motor lit very quickly. I'd say it was a great igniter.

Slim Gem igniters:
I lit an I154 black jack and H242 Blue Thunder. Both igniters lit the motor very quickly. Longer leads would be needed for the longer motors, such as the I200. These igniters are too large for the small consumer loads, but for just about any motor 29 mm through 38 mm motors, these would certainly do the trick.

Hot Shot igniters:
These igniters are intended for two jobs, both involving black powder. You can use them with altimeters to fire ejection charges. I ground tested one of the igniters with an Olsen Advanced Electronics M2 and it fired the igniter instantly. The other use is to fire black powder motors. If you've seen the latest Estes igniters, you can see that there is becoming an increased need for an after market igniters. At present a 6 pack of Estes igniter will cost you $3.79, so the Hot Shots will be about double the price. These igniters have nice long leads, so nearly all black powder applications are easier, but in certain critical applications they're indispensable: cluster, in a tower, with a boost glider, lots of places where reliable ignition and long leads are needed.

Summary:
They seem to be excellent products and since I'm really starting to get into black powder clustering, you can bet that there will soon be a pack of Hot Shots in my range box.