40lb Cap Barbell Set?

I've been looking into these 40lb Cap Barbell sets, and they look interesting. It seem you can max one of the handles out at about 6x5lbs, or about 30lbs. Maybe even 40lbs, if you can still 'screw' on the screw. Anyways I have a few questions;

first: does anybody recommend them? I mean I don't think they can suffer from to many problems being simple weights.

second: Anybody know where you can pick up more of those 'mini plates'?

third: Or does anybody else have suggestions for variable weights?
 
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