The Classic Flanger is great value for money. Depending on the settings you choose, it can function not just as a flanger, but also as a chorus and a phaser. Those are very good options.
The pedal is of a sturdy metal construction, which is excellent even for those who are only playing at home. No risk of breaking the thing when stepping on the switch which would probably happen if it was all plastic.
As for the sound...
It's very analog (in a good way; can't say if the circuit has any digital components).
Want a subtle chorus? A rotating speaker? An out of control phaser? An Eddie Van Halen flanger? It's all here, just move the controls around. The Classic Flanger sounds great together with either a fuzz, distortion or overdrive. Or even on its own. Combine it with a phaser and a chorus and you'll get some totally weird and wonderful sounds.
Buy one. Now. Or better, buy two.