I have a "Shooting Chrony" that I like well enough. It's my second one (the first has been shot up pretty badly by paintball players who don't quite understand how they work - or are very bad shots). One strong recommendation is to get the version with a remote display/control unit. Otherwise you'll find youself at the range trying to read it from your shooting bench using binoculars or a scope (assuming its a public range, and you can't just step closer to read it). Remember, you have to place it a few feet forward of the muzzle, and it has to be in the sun. Also, if you need to reset it, you'll have to wait for a cease fire. The remote display/control unit doesn't cost much more and is well worth it if you plan to use it at a range with other shooters. It connects to the main unit via a telephone wire.
Doug