I'm totally old school. If it's got more than two modes (Regular and PAR), is not yellow, and doesn't say "Speed-Timer 3000" on the front of it, I wouldn't trust it for real-life range use
R-U Ready rules for durability. Mine has been dropped in muddy puddles, stepped on, thrown many times (don't ask), left in hot sun on the car dash, suffered rain, snow, freezing temps down to -30 C, and it just keeps on ticking.