Hi,
I'm using 2 pcs of the Deihl Daily model. I don't encounter any problems setting the timings though. In fact, I find it quite easy to set or reset the timings. I have one setting for Mon to Fri and another to cater for Sat & Sun.
So far, the two timers have serve me well for 2 years+ now.
If u need help with the setting, maybe u can PM me your number and I can contact u
Cheers
Shawn