I've owned 3 or 4 different brands of chronographs since the late 80's. My first was an old ProTach (if I remember correctly). It was OK, but the readout was on the unit, and you had to go to the unit to reset it. I also owned a Pact PC2 and it was an awesome chronograph. No problems at all, other than it is kind of outdated now. This particular unit was stolen out of my vehicle.
I currently own a Chrony Beta Master and have owned it for probably 5 years or so. I don't mean to be the odd man out, but it's a piece of excrement. EXTREMELY sensitive to light conditions. It's to the point where I have to shoot very, very close over the top of the the sensors to get readings, and it's almost impossible for me to fire a string without getting false/inaccurate readings. Getting velocity readings with small caliber bullets such as .22's is out of the question. I've piddled with it, cleaned, adjusted, etc. and it still doesn't work well. The user interface, while useable, is very confusing and just...well...a pain in the a$$.
Last year, my Pop bought a CED Milennium chronograph as he became disgusted with our Chrony. I've yet to use it and it's still in the box, but it'll soon be coming out so I can chrono loads for my 358 Norma prior to elk season. This chronograph also has available infrared screens which work in ANY light conditions INCLUDING total darkness!
35W