Do you use a paint mixer/stirrer/shaker?

[11320 Titanic]

Hi guys,
Say, does anybody out there use a paint mixer/stirrer/shaker for your model paints?
If so, which one would you recommend?
Thanks,

I found an old reciprocating saw that had a broken chuck, bought it for a dollar and brought it home. I ground down a one inch wide balde (taking the teeth off), super glued a 1/4 inch strip old wood across the blade and bought a roll of Velcro from Home Depot, and went to town! There is no concern for the size of the paint bottle with the velcro, it holds good and the reciprocating saw with its speed control (the trigger) mixes any paint. I even mixed up some old Testors Enamels that had dried out and it brought almost all of them back.