Well yeah, as others have said, Pro is more like of a donation. Little changes accur between the Basic and the Pro version (someone like sberlin will be able to tell you more).
It rather depends on wether you consider LW a good application and are willing to help it advance by buying Pro.
That, and the LW people have a hen that lays golden eggs...

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-