They can take line level, but maybe not a super hot 'line' level like you get from some devices. I like these best in front of the amp to be fair. I'd put it in the top 10 legendary pedals personally, I love mine.
Please let me know your results. They've gotten expensive..*that way* as in line level after a preamp in a rack config.
i got my first one because of ej too! it was road hard with tons of nicks and chips in the paint, but sounded killer. i think you guys may have inspired me to try the pedal the "rack way" now!