mine are very shy when it comes to people. The only time they come out is when we are sitting on the couch watching TV. If we are up and moving around, or looking into their tank (especially), they hide.
Otherwise, they are quite active, and I have seen them demolish a few MTS already. There patterns will change over time, and they will become more spotted than striped (from the pictures that I have seen), and I think that is the biggest difference between the kubotai and the rostrata.
I did not know that they were only identified in 2004, that is news to me. Though that would explain the price tag on them ($19.99 each at my lfs, though they recently dropped the price to $9.99. That's when I bought them lol)