I've tested it on ubuntu 12.04 with MT 4.37. With default timeout (20 sec) after running the exploit connection is made but you can't type anything until it times out. Tested with all payloads except ipv6. With timeout you get the session straight away (obviously, 0.5 sec :-). On the Windows install can't remember, can to check tomorrow. Although I'm pretty sure it was the same.