It's all about the palettes. They're way cheaper, you get the instant gratification with B2M, and they're great space savers. I constantly used to lose my most used e/s (whites, blacks, the neutrals I use on almost every eye) but no more.
Even if they won't take panless plastic, you can always save your plastics in a bag and put the depotted pans back in them when you finish the eyeshadow. It doesn't take any more time than it would working just from pots.
As far as portability goes, I actually think palettes are the total best. What I do is this: I keep enough 15 palettes to hold all my shadows, and I have one empty 4 palette in case I need to go somewhere with a specific look. Then I just pop out the shadows I need and go! (usually I do this when I have to do stage makeup, I just stick Gesso, Brule, Swiss Chocolate, and Print in a quad) Believe me, a quad is MUCH easier to handle than 4 pots!
Although I must admit I have been holding off depotting my Moonbathe e/s and blushes. They're just SO GORGEOUS!