I like to use this synth for arpeggiators or trance-mainsynths in my Fruity Loops 4.12 .
At first sight the Interface is a little bit confusing, but playing with all the knobs can be very useful to learn how this synth works and which potential it has. For me the filter is not very good, but there are other cheaper Vst-Synths which sounds more worse or not so good. The Presets (Arpeggiators and Tranceleads/ and very much) are all well and they sound very good for a synth that has this little price.
If you want to buy this synth, buy the Superwave Bundle with the superwave p8, superwave pro and performer. I did it so. With this vst-plugins you can easily create good-sounding Tranceloops and integrate these in your songs. Not good: the Superwave Trance Pro uses a bit to much CPU !!! Don´t set this plug too much into your sequenzer/vst-host. I didn´t use the customer service , but i will do in earlier future to get more informations about this plugin, so that I can create much more good sounds.
A big difference between the paid versions and the free version is polyphony. The paid versions are 10 note polyphonic, the free version is just 8 note polyphonic. Makes the difference when playing chords.
The presets of the Pro are fantastic btw, you get 2 times more presets than the free version.