I will state what I think and believe about systemd.
I'm an Arch user so I had to try it out or at least adapt my init scripts so they could work with the changing system.
I did this for a while but wanted to try this systemd. https://wiki.archlinux.org/index.php/Systemd
I read and used the online documentation to move to it.
At first I tried reading the man page... It's an horror movie!
Following that I found a little pdf explaining really well how to use systemd and it helped me a lot. http://0pointer.de/public/systemd-ebook-psankar.pdf

From this point on I tried to adapt myself to systemd way of managing the system, which is more complete and complex then the system V way of doing things.

The boot process is not faster and I don't like not being able to see what is happening at boot time because it shows too much things moving too fast.

system V is simple and efficient, systemd is complex and away from the config files.