I've only played the trem. Which doesn't have a big counter part, unless you count the ring mod has the big brother. I thought the trem was very nice. Nothing really special I thought. I liked that it has sawtooth and reverse sawtooth wave forms. The big box ring mod, sounds really nice as a tremolo but can't do the sawtooth. I want to check out the drive, that one looks really nice. I love the drive on my cluster flux, I'd like to have more saturation. It sounds really good when you clip that cluster flux.
I've only played the Boost. I'm still learning how to use it, but it seems like a very useful pedal, especially with the expression pedal. I have my amp set just below edge of breakup and the sweep on the expression pedal takes me from just a little bump into break up to about mid level OD and then I can kick on a fuzz for leads, so I wind up with a pretty wide range of distortion to select from. I haven't had many chances to play it with my band, though, so I have to hear how the volume differentials work in the mix - if you run it into a really clean amp, the range of volume boost is too much, but it might be really good if you just want to set a preset volume boost for clean leads and not use the expression pedal.