I can't say that I actually
want periods, and quite a few women have mentioned to me how awful they are and that I'm better off without them.
But, if having them meant I was
not trans, and that I could just experience life as a cis-woman, and also be able to bear children of my own, then I would want them for sure.
Plus, now I'm living "in stealth", when I'm with a group of female friends, and they start talking about periods (or indeed childbirth) I feel woefully left out, plus it's been a bit awkward because they expect me to 'know' and be able to talk and share such experiences, and I can't. So occasionally I fib, and pretend I've been there too.
As an aside, my mother accompanied me when I had my SRS in Thailand, and she likened the experience to going through childbirth, so I comfort myself that I've experienced my own painful rite of passage to womanhood.
I remember a funny story, a few years after I transitioned, and I was working at a large company with it's own health clinic for employees. I was having some occasional problems with my eyesight, so I went along to see the company nurse. She told me that it was nothing to worry about as it was most likely linked to my monthly cycle. I blushed and told her that I didn't have periods because I was a transexual woman, and she said "I'm sorry, what's that?"
I was a bit taken aback that a nurse didn't know what a transexual person was, so I explained. It was clear that she had never come across such people before, and couldn't really deal with it very well. She just said she couldn't help me with my eyesight issues, and told me to go and see my GP. I was on cloud 9 for days after that experience!

But actually, being trans and going through transition is much more painful in many ways, than a cis-gendered person will ever know or experience. And I bet not many cis-females are wishing they could go through the 'joy' of SRS and dilating and all the other painful and expensive cr@p we have to go through to be who we are.