Most will work - the trick to their smaller one is just that it fits into the container - the bigger ones will not.  This assures them a continous revenue stream beyond the inital sale.

Standard connection.  All Primus iso fuel containers certainly work.

BTW my experience with the Jet boil was very favorable - very, very low fuel consumption - < 1/2 a container in a week of daily use at 2 meals a day. [smiley=thumbup.gif]