The Bass Station 2 is a great synth. While many of the commercials show off the electro-house sounds, it is quite capable of doing any analog sound from the warm and soft ones to harsh metallic sounds. Plus it has two filter types, the classic and the acid filter. The classic filter is the standard Bass station filter (or at least close to it) that was used on the original whic was released in the 90s. The second filter, the acid filter, tries to emulate the acid or 303 sound. While it isn't perfect, it can get some really close sounding sounds to the tb303 (especially when you use the distortion). Overall, I would recommend the Bass Station 2 to anyone who is looking for analog hardware. The only thing that bothers some folks is the the key-tracking on the filter. On the classic filter, it is set at 100% and the acid filter is at 50% key-tracking. What this means is that as you go to higher notes, the filter automatically opens more so that you can still get decent sounds. Some folks don't like that since they want high notes to be filtered by the low-pass normally. But otherwise than that, great synth.
The other one which you asked about is the x0xb0x. It is a tb-303 clone and it's pretty good at what it does. It's nothing special and pretty much has the same functions of the tb-303. But there are custom firmware for the x0xb0x that allow you to have a more advanced internal sequencer which is nice. Mine also has a mod on it, which adds more bass to the sound. The reason is that when you increase the resonance, one side effect is that the bass gets quieter. So the mod adds more bass so that it still has presence.