I purchased my Sekonic L 608cine late 2001, to replace a unit I acquired years prior from my Grampa ( it just stopped working).
Long story short, you can't go wrong by using a good light meter properly.
Before digital cameras stepped into the commercial workflow, a lightmeter was a photographers only device for chimping. Used to judge the light falloff all around the subject you would shoot, helped in placement of lights, bounce cards, flags, the list is endless. Well sorta.
Once you get the hang of the lightmeter you chose and start seeing in the photograph, what the lightmeter told you. The lightbulb will go off and 
The 358 will serve you well!
http://www.sekonic.com …-358%20FLASH%20MASTER.asp
Also looks like they have tutorials on there site too.