some people have higher tolerances than others, others may not have the necessary enzyme needed to metabolize the M1 metabolite from it, as well you may be looking for the wrong type of high from it, while true that it does brush the mu receptors, it is extremely mild and if you have any type of opiate tolerances you won't find much opiate effect, it may just keep you from getting sick if that, now when looking for a buzz from tramadol you need to be looking for the speedy snri effects, this is what I enjoy most about tramadol, and even with a moderate tolerance,( 30 mg of oxy to feel good), after a day of taking trams all day (400+ mg) I notice quite an opiate euphoria. But my main effect from taking it is, the productive speedy snri feelings it produces, this to me is it's most desired effect as well, some people hate it, others like me love it.
if your not enjoying your Tram feel free to send it to me I will thoroughly enjoy it!