Rapid-torch flamer's stats are almost 100% identical to the regular flamer. The only element different compared to normal flamer is attack animation. The difference in animation does have actual in-game impact, although minor. With the rapid-torch flamer, it's enough to quickly tap with mouse or trigger to fire your flamer, expending 1 point of ammunition in the process.
With regular flamer, there is slight delay before fire gets out, so in order to just expend 1 point of ammunition you need to hold fire button a little bit (but not too long to expend two ammunition points). Therefore, with the Rapid-torch, you can conserve ammunition a bit better than with a regular flamer.
It is weaker than the other unique flamer added by Broken Steel, the slo-burn flamer.
It can be more efficient than the slo-burn flamer, due to the fact that the Rapid-torch needs to reload 1/3rd as often, and it deals more damage per unit of flamer fuel.
Without Pyromaniac it is about 1/2 as effective as the other unique flamer in the game, the Burnmaster.
It is still obtainable after Who Dares Wins is completed.