I am wondering the same thing. I don't have time to cook for him either. I've done it but it is too time consuming for my lifestyle right now. Right now he is eating Solid Gold Wee Bits. I've fed him Canidae as well and he seemed to like it. I think both foods are good for them and are reasonably priced. Since I only have one yorkie spending $7-10 on a 5lb bag every 3-4 months works within my budget.
I might just go back to Canidae because the weebits is too small for him now. All he does is swallows them and ends up eating too much...then he throws it back up.