I don't think 5 fps either way is a big deal for the hobbyist (particularly full-bore). If you are chronographing professionally - that may well be a different story - i'm sure the costs are way different too. I have a Chrony - I constantly get errors due to lighting conditions such fluorescent lighting (which I have no control over) or for some other random reason I can't quite figure out. I live in fear of accidentally shooting the thing If chronographing at a public range - there may well be problems putting a standard chronograph in the line of fire. Having your chronograph behind the line of fire is an advantage in these situations. 6 of one, half dozen of another - choose your limitations.