Do you guys think the benefits the Uni offers in doing it are actually that good?
not the increment the other stuff i mean
What course are you planning on doing?
For eng or science it is very helpful, as you have a base of some uni maths before coming in. So when you do subjects that have a mathematics component you'll be ahead of what they expect mathematically, so it should be easier. Plus, you'll get to skip first year maths. Plus you'll get full credit for both subjects, so you can take a lighter load one semester or take additional electives etc.
If you like maths, do it. You should be able to do reasonably well. And I think everyone will be having a hard time with the course change so don't worry. Also, as the year/semester progresses you should become more confident with the material. I remember at the start of the year I was totally lost, but I ended up getting highest achiever.