well you can't shoot or sniff it. so you won't be getting any sort of rush. in my experience though, 5 grams of kratom is a good buzz, and 10 grams is a great, if not super-strong high with serious legs. it's definitely worth your while if you're interested in a non-typical opiate that lasts pretty much all day. cheap as fuck too. FWIW, I like it a lot. YMMV.
and finally: just don't go into it thinking that it's not a "real" opiate because withdrawals are very real.