I think some people don't feel anything from Tramadol, because i too had the same experience. After years hooked in heroin,codeine, opium etc, lately i've been on about 60mg DHC a day. One day i though of, why not give Tramadol a try for some recreational weekends?
Well i got some legit ones and first time i try 100mg just after waking up and felt nothing. Waited 2 hours, took another 100mg, still nothing...
Actually as I am typing, i am giving it my last chance, but this time i took 30mg pure DXM before dosing 200mg+100mg off Tramadol an hour later, having no effects at all! So I ended up taking 30mg of DHC and some Atarax which did the job at least!