In your position, I would suggest to base your decision on your age.
If you're under 30, go for it.
If you're over 40, forget about it - unless you're SURE that 3 stripes will make you happy until you retire. Once you're over 50 and still sitting to thhe right, you'd otherwise get nervous, and that takes the fun away.
One more thing if you're over 30: forget about the company pension plan. The way it's set up, only captains receive substantial contributions. Unless you can look at 20+ years in the left seat, the resulting lump sum is not worth mentioning.
Sorry if that doesn't make it easier to decide...