If you are a synth buff Tassman is a beast, with it's modular approach it's hard to think of anything you couldn't do with it to get a sound. Even at $349 if you were really serious about sound-design it's still probably good value.
I would say it's not for the faint-hearted, but for $99 it's certainly good deal.
I'm one of those faint hearts and it's probably beyond my attention span to be able to do it justice was the conclusion I came to after trying it out awhile back.
Certainly a must have for a hardcore synth head at this price though.