They were also sold in the US under the Federal Pacific Stab-Lok brand name a while back. The US versions had some issues though. The Canadian versions as far as I know don't have these problems.
I'm not sure how much I like these panels, they seem to be good enough quality but they do look strange with the tiny colour coded breakers. I'm hoping to replace my Dad's panel sometime (not the whole service luckily) but I'm debating which brand would be the best, the four choices here are mostly, Siemens, Square D, Cutler-Hammer and these Stab-Lok panels, I'm sure you can get GE panels too but they seem to be special order.