I've got the light little plastic Frankford Arsenal, and although it works, I don't use it much. It's kinda loud, low capacity, and likes to dance a bit because of its lightness. It was cheap to buy though.
Now I mainly use my Thumler's Tumbler Ultra-Vibe 18. It's about 5 times heavier than the Frankford, and has at least twice the capacity. It's solid, quiet, and just purrs like a kitten when it's on. It's also properly sealed with rubber when you screw down the lid. No (lead) dust particles escape when it's on. It did cost a bit more, but in this case at least you really do get what you paid for.