It doesn't have the Subharmonic feature, but you can better by a MicroPOG or POG by Electro Harmonix for that.
The MAG300 gives every bass a certain growl. A bit like Trace Elliot (also a Mark Gooday design), which lets every bass sounds like a P. Maybe I exaggerate it a bit, but it's a bit like that.
The Little Giant (which is very new and the Dutch importer have them just for a week or so) 350 is a lot cleaner than the MAG and it's a bit vintage sounding. With a good 7 band EQ. The 1000 is even better according to the agent, but that's more in the Markbass price region. The interesting thing about the 350 for me is that it's very compact and cheap.
Note: It's very ugly! MarkBass is classy and so are the small Edens. This one has a kind of shiny green sticker as front plate and the controls look cheap, but one can easily upgrade that. In a bit darker environment (stages, rehearsal room) it looks a bit better, cos then it isn't as shiny as in daylight.
But I am quite impressed by the Little Giant.