It does take some getting used to and you need to find one with high impact and quick charge rate. Nothing worse than landing a full FR shot and leaving them with a sliver of health.I'm still not good with FRs. Only good with the Vex, lol
Plugone, foil, plan c, pocket infinity, light of the abyss are all good ones.
Once you get the hang of it you'll realize how unbelievably OP it is. Basically a shotgun with long range.