Imperial forge had a mini review of the knights here: http://members.bellatlantic.net/~vze2h4x8/id35.html
My impression is that they are fiddly, and "soft" on details, but that is only from looking at the pictures. Remember that they make primarily 1/72 soft plastic figures, so the style of sculpting is different.
The fortresses are great products though, if a bit small for 28mm figures.