The Stereo Pulsar is great and instantly gives you the option of a few classic trem sounds. Your controls consist of a waveform choice (Square, Tri), a Pulsewidth control, Rate and Depth. Rate goes from near DC to what sounds like about 30 Hz, and the depth can go a little over 100% so that the signal begins to invert back on itself, leading to a swampy sound similar to the Harmonic Trem of some of the Fender Amps.
Cool things:
The Pulsewidth control - Lets you make your square wave into a Dark Side of the Moon esque pulse tremolo sound. You can turn your triangle into a saw or reverse saw for weird volume swell sounds.
Depth control - The overmodulation that comes from going past 3 o clock on the depth on a triangle wave setting is instant Bo Diddly territory. With a little dirt you've got a filthy electric blues/RnB sound.
Less than cool things:
Volume Drop - On higher depth settings the signal can seem a little quieter. A little extra volume available to make up for it would change the world for me.
Bunching - getting exactly the right rate is always messy, but I find it really tough on this pedal sometimes. The depth is tricky too, but I play into dirty amps a lot and I don't tend to use this in the FX loop so that's my own doing.
Overall it's really great. If you want more features, like Tap Tempo, then obviously the Super Pulsar is the way to go. But this is a really nice trem and I think most guitar and key players would be pretty happy with what they get with this unit.