We (my current group) hadn't ever played the game in 3.5. I believe the players liked the conversion. They had reservations about Fantasy Craft though, but we worked these out.What reservations are you talking about? I'm scheduling my own group to a 3.5 IK --> FC IK conversions... and, let's just say that the tides are running high...
Oh, little things.
We started the Witchfire campaign at Level 3 and the Mage complained he didn't have Scorching Rays and Invisibility and powerful spells like that. But it went better when he discovered he had quite a lot of skills he could use and also cool non-offensive spells.
They didn't like fighting undeads, at all. I must say it's also frustrating for the GM to play dummy skeletons after a few hours. Their favorite fight of the first scenario was when the assassins ambushed them at Fort Rhyker! Hopefully, there are much less undeads in the rest of the campaign.
One of them played a non-social-at-all trollkin brawler. Oh, he was quite invincible in close quarters but he got sick of his character after the first scenario. I told him not to min-max his guy and try to be a little bit more flexible. His next character was much more interesting to play.
And, for the guy asking for a for a english version of Aegis amazing document. I'm currently translating it, but it might take a while. Just reached B, and I'm working from my High School level french lessons and google translate here.
The bestiary, right? Because the conversion guide is already available in English. I believe it's an even more recent version than the French one... :p