Hello. I know this thread hasn't been active for a while, but anyway...
I believe I have the same issue as supershick. It seems to me that after snoozing, it doesn't always take 10min to ring again. I've seen as much as 40min.
You might think I'm not completely sure, as it's pretty hard for an alarm clock to wake me up after I get used to it, but this never happened with my old N-Gage (my previous phone O.O).
I always set the same alarm to 6am thinking I should be up by 7

And, I've never used anything else to snooze since I found I can just grab my phone and push any volume button (so easy with your eyes closed

.