If you have, and are proficient with, the C4 or FI, this really doesn't add much to you. My strong suggestion would be checking out videos of the SY-1 on bass, because there are way more. If you like the sounds in that and feel like you'd use more than 2 or 3 of them regularly, this would be the option to get.
I am not great at programming, so having the dial a sound option is better for me. For instance, I needed a synthy violin sound for a Christmas service at church. Turn to strings, dial out the dry, pitch up, save. Took about four minutes. I had a section where a bell or chime would be needed, dial to a different preset, save, and with an external switch, I can swap on the fly without needing MIDI.
If you're looking for something unique or super customizable, this isn't for you. I like it because it's basically idiot proof, I don't need MIDI, and it's super easy to run my drives in the loop to layer in extra sounds. A synth lead line with a Doom2 hitting the dry mix is a really nice combo.