Used the Combi Plant Tank for a 4x5 class that I took at community college. From my limited experience,

Pros: Allows you to work in daylight once you've loaded the film in the k, suppo sedly reduces scratching the negative, easy to use and load.

Cons: Cheap plastic construction, expensive (about $45 from Adarama and B&H), ca n only process 6 negatives at a time.

As I said, I used it (and purchased a tank) for use during my course and I only used it (I didn't do tray developing so I don't know what that's like). I will c ontinue to use the tank when I process 4x5 negs. The tank can also be used for o ther negatives (smaller) but the size escapes me.

Feel free to e-mail me with additional questions.