Can climb up 3 stairs, you just need to get the front wheel on the top, lean foreward pedal and pull the backwheel with you. The better you get the faster it's done. Only crashed once while trying(and of course there was a lot of people watching).
Down a couple of stairs is no problem, and if i cared less for my bike i think i could make it down a set and even skid down them - but thats a sure way to bend a wheel or crack a helmet.
You can do dropoffs i have done a couple just abuot 1/2m - 3 stairs, keep pedaling and suck up the landing with the whole body, it feels so good when you hit it just right, it's as smooth as if you where riding a mtb.
I have posted a pic. of my flying beauty.
Fly safe.