Depends on the culture of your workplace, your attitude and how you present day to day (are you hardworking, helpful and a go-to person?)
If you are well respected, get good performance reviews etc - they'll likely take your feedback very seriously.
I had a colleague who would give the most outrageous feedback in very public forums but he worked his arse off, he exhibited behaviours that made him part of the solution (very much a - I will demonstrate the behaviours I expect to see) and he flew through the organisation. Promotion year on year, pay rises etc. He would say something like - I think culture amongst senior managers need to change, we need to be more upfront about pay, there is a discrepancy between what senior managers say and what we perceive them to do.
- that's hard hitting feedback and there would be eyes wide open in shock listening to him saying it. But he was also right and he walked the walked. He ironed out these issues on his own team (who went on to be the best performing team in the department). He was respected by all outside our department and the key thing - he delivered. He consistently delivered everything.
Conversely we had another member of staff who also gave outrageous behaviour, again most of it accurate but she was like a dog with a bone, she wouldn't say her thing and then move on, she'd repeat herself, give multiple examples, and argue with any defence - it would make everyone cringe or by the end we'd all be bored. Then outside these meetings she was lazy, easily distracted, talked endlessly, would always have a clothes shop website up on her computer, always had a reason why a piece of work couldn't be done or delivered on time and moaned about stuff that honestly no sane person would have the time for. Very combative but in her mind 'telling it like it is'. She couldn't see how her words created reactions.
Now both of them were exceptionally smart. And the female in this had some amazing insights and really did have a strong knowledge on her subject matter. But in the end she was squeezed out as more and more managers just couldn't handle her.
It's not always that her feedback was wrong it was the way she went about delivering it and then how she came across after the fact. You can't spout that Senior Managers should be doing XYZ then go back to your desk and spend 30 mins looking at Mulberry handbags and expect to still have credibility.
On a personal level - she was far nicer, warmer, and funnier than the man in the example and we did feel bad for her when she handed her notice in because it wasn't working out. But it also wasnt at all a surprise. The frustrating thing for all around her was that she was so smart that it was blatantly obvious that Senior Managers didn't want to lose her, she really did it to herself.
So tomorrow be the embodiment of the change you want to see in your organisation. Demonstrate a high level of professionalism and dedication and your feedback will be viewed as helpful. Be the person who throws out the feedback while also has Facebook up on her computer and then misses a deadline and you'll be viewed more unkindly.
Unless of course you have an awful culture! In which case - you're better out anyway.