I always consider the rulebooks worth purchasing' I always prefer the tactile sensation of paper in my hands. There is the philosophy of try before you buy, though. Tou might want to invest in a couple of gangs and give it a go. The system can be played historical and/or Horror/fantasy.
This is a system where I have decided toinvest in scenery, which will likely be your largest investment. there are several manufacturers of wonderful laser-cut buildings that are enjoyable to assemble.
I assume QRS are Quick-Start Rules... The gang sets should include them, I recall a video that expalined the mechanics as well.
Wilde's Rangers is the only Military set out of the gangs
and that's more of a "Kelly's Heroes " style of Military. There don't appear to be rules for bystanders... the style of play is fast enough where you'd assume that they're hunkering down.