The pen silo is by far what I love most about the motion C series, it will make not having a pen silo pretty difficult. The silo springs open once you press the silo button on the side of the tablet. You then just slide the pen in and out, and then to close you just press the silo compartment closed and it automatically latches until you press the button again. It's pretty durable too. I tend to have nervous tendencies with things in my hands, so I open and close the silo ALOT with out even really noticing I'm doing it at times. I haven't tried out the new 4.0 pen, but I sure wish n-trig would finish the windows 8 drivers for the CL900. I'm pretty sure that will never happen though, so I'm just patiently waiting to upgrade the entire tablet.