I really like it, even when I'm not a fan of science-fiction myself. The storyline are interesting IMO. Of course some details may be a little confusing the first time you read it, but if you pay close attention and "digest" it slowly, you will indeed find the excitement you need from the plot. Well, that's all I can say so far because I've only finished volume 4. I'm looking forward to seeing the true identity of that "Friend" guy...
Also, I am really relieved that this manga is not long-running at all (also a reason why I like it). I usually cannot follow mangas which are too long-running (as for Conan, I only read BO arcs, not fillers).