haven't they replaced the cub with the Mytee lite ?
You can get the cubs machine spec in the airflex mini or alltec express , but youl also get a decent body design also.
actually u can get a single 8.4 in the airflex mini , but why woiuld you .. the twin vac will be more powerfull ... and an inline heater that would be aboyt 600 as an external is only 200 to add on as an internal , no brainer , Express or mini .. . or mytee