the 30 round version works well and is already big/heavy when loaded. I wouldn't be pursuing the frying-pan sized version but to each their own.
Pros=look cool, run fine, hold 30
Cons=all plastic even on areas that are high wear, slow to load, pricey, heavy/bulky when loaded
I think it would be fun to have/run one of these....but based on my experience the time spent loading nullifies an almost equal amount of "fun-factor" so after a few mags=more inclined to run the factory 10s