I am REALLY DESPERATE FOR AN ANSWER!! please help me! its for AP Gov. ToT

The question is: Presidents appoint judges to the federal court. They serve a term for life.
what are 2 advantages and disadvantages of having judges on bench without the fear of having them removed.

Please help me!!!!!!!! PM me too! Email is fine also!!
Thank you in advance!

PS. Mods I posted this twice. I wasn't sure where this post belong. Please remove if it's unnecessary!!!

Pros: -Plentiful years serving so experience is gained on the bench.
-Since each judge has been appointed by a president and approved by senate of certain leaning/majority then you can slightly predict the rulings of a judge : activist or restaintist. But remember since they're lifetime, they can make their own decisions and not subject to public opinions.
Cons: -Same for Congress, not many change of position so it limits the flow of ideas and essentially "whats going on today"
-They decide constitutionality of the law, though depending on the judge him/herself, he or she can shape the laws which isn't meant for the courts. They're given more discretion, such as to create a precedent(which can consider a law) and can/should(in my opinion) defer legislation/law creation to the legislative branch.

This is just the top of my head, sorry can't provide the AP gov't facts since its been a while/don't have my notebook. Good luck and just think of possible reasons, they're all good =P