I have the XS2 and it is perfect for my setup. Plus it came with a carrying bag which I appreciated.
I'm looking at the XS2 at the moment. It seems the perfect size for bass as we (generally) don't have huge numbers of pedals like many guitarists do when playing live - obviously there are exceptions.
I'm hoping the XS2 will comfortably fit on the top row the Origin Effects Cali76, BassRig 67, Bassrig Super Vintage and a Turbo Tuner. Making the pegs staggered so the pedals are as close as possible in one vertical line as all their inputs/outputs are on top so side access doesn't matter. Then having most of the bottom row of the board for playing around and switching things up or the tuner if that doesn't fit with the Origin Effects stuff.
Going off the dimensions on the website, it looks like the XS2 will sit very nicely on top of a Fender Rumble 200/500, which would be nice, as I have these pedals going into the effects return - though I haven't tested that and will when I get my board.