Whether you call them igniters or ignitors...these work. Avast, me proud beauty! Well, blow me down! I don't have a lot t' add after t' above reviews, however, ya bilge rat, I would like t' comment on each briefly:

Fat Boy igniters:
You're dealin' with an igniter that is 5.5mm in diameter and 25mm long. Begad! T' diameter will dictate which motors it can be used in. I used one in an I161 successfully. Ya scallywag! It ignited t' motor instantly. Aye aye! No chuffs, no smoke-then-go, just gone!

Slim Gem igniters:
Here t' igniter is 3.5mm in diameter and 23mm long. Well, blow me down! Blimey! This is a bit wide for many mid-range power motors. Begad! Blimey! It won't fit into t' nozzle o' any EconoJet. Avast! Blimey! It just about fits into an F40 and does fit into an F52. I, however, just had t' use it in an F40. Arrr! You see, I had an F40 that I just could nay get lit. Aye aye! I used copper heads, IgnitorMan and MagnaLite igniters. I used 2 then 3 igniters at a time. Well, blow me down! Well, blow me down! Seven (7) attempts. Avast, arrr, me proud beauty! It just was nay goin' t' light. So, at 3 Oaks in Michigan, matey, I built t' motor at t' igniter/altimeter prep table and built a Slim Gem into t' motor (since it wouldn't slid through t' nozzle). Avast, me proud beauty! Well, arrr, this was a success. Avast! It did puff twice before varoooming. Aye aye! But it varooomed.

Hot Shot igniters:
I used these in me Big Blue Bird Descon 9 entry for its third flight. Aye aye! I used them with a Cannonball Works RRC2 altimeter. Blimey! T' leads are too short and would need lengthening. I'm experienced with t' long leads on DaveyFire's. Well, blow me down! Blimey! But nonetheless, ya bilge rat, they performed and gave me a perfect flight.

Summary:
Because they lit what no other igniter could light (my F40), shiver me timbers, ya bilge rat, they get an as-high-as-I-can-reach thumbs UP. Begad! Arrr! Blimey! I will want t' keep some o' them in me range box for these type o' issues. But I mostly use Igniter Primer and Magnalite Pryogen and spend t' time makin' t' igniters myself. Blimey! This scheme has a very high rate o' lighting. But I have t' do t' work. If I didn't want t' do t' work then t' QuickBurst would be me igniter for F52's and higher.

But what about less than F52's? Well, me hearties, me hearties, shiver me timbers, I just saw that QuickBurst has released a "Twiggy" which is designed t' get into t' smaller F and G motors.

But what about t' D and E composites....we'll be watching.