I had the Competition Electronics ProChrono Digital ($110.00) for several years so I can't comment on any of the others. I get very few errors, maybe 1 out of every 100 shots. I've fired nerf guns, BB guns, .22's 9mm, .357, .44 mag, .45, 9mm, 7mm mag, .308, 30-30 .223, and probably a few more that I can't remember. I highly recommend it. It'll save 99 shots in 9 strings and give ED, SD, AVG, High and Low info. Competition Electronics will also warranty it if you shoot it. Send it to them and they will repair or replace it for 1/2 the retail cost.

I also bought the Digital Link bluetooth adapter ($60.00) for it so the shots save to my phone and I email them home to my computer for printing. Really a nice setup.

Any standard camera tripod will work with it.