RIXM  Tried this on my 20" iMac (Tiger) and it crashes on launch. Would have been nice to try it out, though I'll admit I wouldn't purchase unless there is a lot more functionality in the app than what appears in the screenshot. Twice what I would even consider for something like this.  
(Version 2.0)

WOLFEATSWORLD  Sorry, But I've tried everything, the app won't open on my 20" running 10.4

Hardware Overview:

Model Name: iMac

Model Identifier: iMac7,1

Processor Name: Intel Core 2 Duo

Processor Speed: 2.4 GHz

Number Of Processors: 1

Total Number Of Cores: 2

L2 Cache (per processor): 4 MB

Memory: 4 GB

Bus Speed: 800 MHz

Boot ROM Version: IM71.007A.B00

SMC Version: 1.20f4

Serial Number: QP7410X6X86  
(Version 2.0)