I downloaded 1Password for the iPhone close to 3 years ago when it was first released, and it was free back then. I've used it ever since, and I've tried the free trial for the Mac to transfer the passwords to a new iPhone, and it worked well, but now it won't allow me to use more than 10 entries or so on the Mac version unless I pay.
I also wanted to use the iPhone version on my iPad, but it seems like a hassle to transfer the passwords over, so I simply have them on my iPhone for now.
It's a great app though.