Bought one pack to try and used two so far. Lit a 24mm Aerotech F and a 29mm Aerotech G without hesitation. If the first two are indicative of overall quality I would say that these are a great substitute for First Fire Jr at half the price.

I'd heard horror stories about these, but mine fired perfectly the first time. As an added bonus, the igniters come packed in long launch lugs. Great all around.

These igniters surprised me. For years I have made my own igniters out of shooter wire, nichrome wire, and my home made pyrogen formula. These often have a high resistance and some launch systems have trouble firing them due to lack of sufficient current. I used these to light my own experimental motors (38/120 and 29/120) and they worked great! The motors did not light quickly, but they lit. They are a little on the expensive side at the retail price, but the sale prices here on Hobbylinc make these a great purchase.