http://theknobbery.com/cabinet-hardware-sizing-guide

-Thanks reeny. That helps a lot. I'm assuming you like the look of two different sized pulls since they are each proportional to each door vs having two of the same sized pulls on different sized doors.

I have to disagree w/you naysayers. It's quite functional, thank you. it doesn't pull the drawer wonky and works just fine, nice and smooth. Nothing is pulled out of alignment, even if I do use one hand. And yes, my heavy pots are in there. Perhaps your cabinet maker isn't using sturdy drawer glides. good lord. Not all pulls come in 12" and larger. I happen to think the pulls in the other pic posted looks very modern and I didn't want the look of appliances sized pulls on my drawers, in spite of what you think is correct. I think the 3 of you are being a little dramatic. I see double pulls all the time.

Do you mean shaker style doors or a truly flat slab door? If you mean a slab door then I would lean toward something sleek and modern to complement the modern look of a slab door. Drawer handles at roughly 1/3 the width are visually pleasing ... except if you have narrow drawers (like 12" wide or less) and then I go with "what does my hand fit into nicely?". I think I wound up with about a 4.5" handle on those drawers, just a smidge larger than 1/3 of the width. On drawers that are wide, like 30+", you might struggle to find a single pull that is large enough. I used 8" handles on my 30" wide drawers because the style I liked didn't come any larger - unless I used an appliance pull and those just looked wrong. It looks fine, larger would have looked better but my island has a 30" base, 24" base, 30" base in series and the drawer handles are consistent so it seems reasonable. Good luck, they are expensive little things when you need so many!