At what limit does low limit stop when playing on internet?

I have heard people say playing 5/10 on the internet is like 10/20 in B&M. At what limit on the internet do you consider low limit play stops and middle limit play starts?

My own experience says 3/6 is low limit, but once you get to 5/10, you see more middle limit players, and middle limit play.

I would agree with your assessment. In fact, 3-6 can get pretty tough. Once & awhile there is a fishy game at 5-10, but perhaps 1 in 10.