I tried Imogen Rose in spray form, and I found it strikingly, uncannily realistic. I swear to god I could smell the pollen and leaves of a rose bush - like ChildOfTheMoon said, it's much 'dirtier' than traditional rose scents. I honestly wanted to like it for its originality alone. Unfortunately, I'm not a rose person, and I still found it too sickly for my tastes. I also found the 'pollen' smell a bit overpowering. I'd give it two stars for smell alone, but it gets an extra star for its originality.
I purchased Sakura in solid form and, while I like it, the smell reminds me a little of Shake 'n' Vac or freshly laundered fabric. (Which isn't a great endorsement, I know, but bear with me.) It's fresh, floral, and slightly lemony - I think of it as a 'clean' smell, although it's still nice and subtle.