I used the Spectra Pro IV-A for the last 12 years, and what a great meter it is. However, unbeknownst to me at the time and completely out of the blue in the middle of a shoot, my light readings were coming in 1 1/2 to 2 stops over. Dallies were 2 days behind, so we didn't catch it until then. Getting a new light meter in the middle of the Mississippi river took another two days, but I finally spent the cash and sprung for the Sekonic L758-Cine.
I had no idea that the Sekonic meter was so advanced! With quick buttons to calculate wrattens and the ability to program your latitude toe