I've heard the LCD2 yes. Its midrange is very balanced, but the presence region around 3khz was a tiiiny bit below neutral. It also could have used a treble boost of abound 2-3db throughout its entire treble range.
I probably wouldn't get much LCD-X complaint posting on an LCD-X thread, but I assume there are at least some honest people here and there.
I owned the LCD-2's for just over a year and although I think they're excellent, I had some issues with sub-bass that could sound loose at times, and treble that sounded subdued (and occasionally a touch grainy) compared to the mids and bass. Although the LCD-3s have a clear technical edge, the mid-centric signature wasn't my preference. For me, the LCD-X's have addressed the technical issues of the LCD-2s, added refinement and detail, and have a balanced signature I love.
This thread is full of honest opinions from people with considerable head-fi experience. If you think the posts are suspect because people are generally pleased with the LCD-Xs--then there's no substitute for auditioning them yourself. I was happy with my LCD-2s and would have immediately sent the LCD-Xs back for a refund if I didn't think they were worth the (considerable) additional cost. I'm not rich and have no interest in needlessly spending money. The posters on this thread have a range of equipment and no special relationships or financial interests in Audeze.