Yeah, I've seen those. Over here in the States they are on Walmart generic superstore bikes. Note that these bars have to be splittable to remove/install those shifters. Course, that doesn't mean they aren't safe, but I think I prefer the usual one piece bars. I actually like Gripshift like shifters (just my personal opinion) and would love to do something similar, but I just don't see how you can install any of them on a road handlebar (at least on the top section).
FYI: I have Kelly Take Offs on my tourer and commuter bike and love them. Not quite the same but a different way of shifting for road handlebars without having to take your hands off the bars (or using expensive STI/Ergos).