This is something of an oversimplification, in addition to being mere opinion on my part, but the way I look at it is this:
When it comes to timers, you can either spend about $130 on a blood-simple Pact III timer, have it last a loooong time, and put up with the possibility of having to go through the utter horror of using a jeweler’s screwdriver ( :eek: ) instead of a control feature to adjust sensitivity OR one can go for the feature-rich timers that cost about the same to over 3x more, and expect to replace them at fairly rapid pace.
IF what one does with a timer rates the purchase of the feature-rich ones because those features are either very useful or very convenient, simply know that none of them have proven particularly robust, so have a care with them while in use.
Hell, I know guys that successfully rock the iPhone shot-timer app, but they need to buy an external mike because the on-board one doesn’t cut it. There’s many roads that lead to Rome…
I used to get ruggedized cell phones, like the Verizon G’zOne Boulder and similar. About $400, balls-out retail. They can make cell phones, with ALL the stuff they do (messaging, calendars, data transfer by cable, sounds, freakin’ GAMES…the whole enchilada), AND make them tough enough that I had NO concerns over heaving it off the top of an LAV-25 turret in a fit of NCO-ing (i.e., rage) without going TU…
…but something as simple as a ruggedized timer, despite having only a fraction of the functionality as a modern shoe-phone, manages to escape the industry. 
I’ll cop to not knowing a bloody thing about the whys and wherefores thereof (software…? …phones use software, too, WTF…), but I don’t think it’s a stretch to say that from the outside looking in, it seems distinctly weird.