I have both the heart of metal pen and the push-up pen but for me. I prefer the push-up. It is light weight and comfortable in my hand and it doesn't roll away on the table because of the clip. When not is use and quickly retract the nip to protect it.
I’ve been writing a lot for my meetings and used up many books. I love the super note Manta and it helps me organize with the star and headings and keywords feature. They have a great roadmap. Love to see integration with MS Office 365 with many professionals using it.