I believe they're pretty short lived - less than a year from egg to dead. There isn't a lot of information on line about keeping these, but I talked to a guy who had some at a Reptile Show a few years ago. I was tempted, but between the high prices he was asking ($95 each) and the short life expectancy, I passed on them. I suppose it would be worth it if you could get them to breed and keep them going for multiple generations.
Yeah, you would definitely want a sexed pair, it seems many of the cool looking Orthopterans are short lived unfortunately, (JCs, Armored crickets, predatory katydids, etc.). Still, if I had the money to buy them I'd jump on the first offer I could find, from what I know imports are really rare in the US, but they are usually available in the UK. They are awesome insects and I'd love to try breeding some!