They all need fettling from the factory so as long as all the bits are intact no problem. Seen one crack on the top crosspiece casting in a school workshop. I've got the small version myself, does what it says on the tin with regards to capacity and no more! Handy bit of kit.
I have one, bought it years ago and it's quite a handy tool if you work within its capabilities. Rated for 1mm, so will just about handle the old 18 g steel sheets. The rollers are a bit on the feeble side, but you can eventually turn out some reasonable curved shapes. The box and pan folding facility is quite a useful feature.
Mount it on a hefty bench or stand.