I got about 7 episodes into it, but quickly became bored. I'm barely a fan of First Gundam, but Ideon is a bit of a creative lull for Tomino. The characters are uninteresting, the mecha unexciting, and the show is a step back from 'real robot' to 'super robot'. Interest in Ideon seems to be based on its macabre reputation and its supposed influence on Evangelion. With the fansubbing of Ideon complete, the series has lost its charm as a little-seen oddity, its actual (lack of) quality can be witnessed and one or two supposed facts about the series have been exploded.
I have heard that (similar to First Gundam), the best way to watch Ideon is to watch 'A Contact' and 'Be Invoked' alone, and to not bother with the series. I've also heard that it's supposed to improve after the first 10 or so dull episodes if you do wish to endure the series. I may come back to it someday, but for now, Aura Battler Dunbine and Heavy Metal L-Gaim are priorities on the Tomino road.