DS started with typical ZB -- just whatever was in the workbooks I picked up at chapters, I didn't even know it had a name, just went with the default.
When he was about 5 or 6 I learned about D'N and the "cursive first" idea. His writing was still pretty bad -- I shouldn't say "bad", how about "undeveloped" -- so I thought it would be a good idea to try D'N.
He loved the letters, but hated doing worksheets. (I think there's some dysgraphia at work with him). Only the 'a' ever really stuck in D'N style for him.
We tried switching to cursive. The whole not-lifting-the-pencil thing really makes sense to me. Once again, he loved the letters, but hated the worksheets. And after many years, even at age 10, his writing was still a terrible, terrible mess, he'd even forget how to form letters in cursive sometimes. His writing when he was just writing for himself was always in basic, messy, printing.
Finally last fall we switched to Italics! I bought Penny Gardner's e-book. It's been a total blessing. He actually enjoys the sheets, and of course we can do copywork from his favourite books. And while his writing certainly is not GREAT, at least it is noticeably improving now.
Having tried just about everything out there, I'm planning on using this Italics style with my daughter from the beginning!