CFI Renewall AOPA/Jeppesen
I am just now doing the AOPA/Jeppesen course. I have used Jeppesen several times already and I like it. It's interactive, has a nice design and it helps me to be up to date, not only as a CFI.
I have tried Gleim last time (because Jeppesen would only server the western hemisphere, go figure, in the UK it would depend if you are east or west of Greenwich) and I would not say it is a bad course, but I thought it is pretty boring. You have to read a lot and the layout without any graphics (that I remember) and very simple text layout, makes it hard to stay focussed.
Before using Jepessen again, I contacted American Flyers, but they never replied.
Some Jep courses take me quite a while to complete, at least more than 50 minutes. The activities become more and more difficult, but the test is easy in comparision. There are a few bugs in the website and I had a problem using it on the Mac, after the famous Java update lately, but I figured it out.