Well it's not really a gamble as you're guaranteed a permanent job once your list number comes up. And the one year probation is a criteria for remaining on the job regardless of whether you're provisional or permanent. Just be on time everyday, don't call out sick or get customer complaints the first year and you'll be fine.
Station Supervisor Level I
I hope it's just like that. Do one year to pass probation, wait for the list to be established, then become permanent. Maybe I'm just salty given the title has a precursor "temporary".