I’ve never done any of the rc’s mentioned but in my mid teens I abused methylphenidate and pure ephedrine hcl and founded it back then awesome for concentration and recreation value too. But this only lasted for 2 years. So my past memories of those 2 specific are 2 awesome stims and at right dosages can be used in a lot of ways or reasons for that matter,I have very little experience with traditional methylphenidate, I think I've only taken it a couple.
With that in mind though I have definitely enjoyed 4fmph at times. I think it can be useful for both productivity and also recreationally. If I do some strong bumps I definitely get a rushy buzz for a little bit, but it kind of requires higher doses which might increase some side effects. It's not as good as cocaine of course, but it has a similar buzz for me personally.
I do think it's useful, but I would like to try mph a few more times before being comfortable drawing any comparisons. It seems like it gets mixed reviews regarding how it stands up to methylphenidate.