those are the chinese clones of the hakko 936, another popular clone is the
AOYUE 936
i'm not a soldering expert, but the reason why you want to upgrade from a 7$ radio shack pen solder is to get control, like super temp control, why would you ever trust ****ty chinese copy cats for that?
i've used my hakko 936 for 2 boards and a few electronic stuffs, it's LOADS easier than a ****ing radio shack pen, the upgrade is amazing. i've also used it to de-solder, just get the sucking pen.