I bought the stuff to do some seni-hydroponics a few years back when it was a fairly new idea. I never used it though. A friend has been pushing me to try it, and since I already had some pots and a 50lb bag of LECA I'd purchased 5 years earlier and have moved it to 1 new town and 2 new houses, I thought it was time. So far I've only moved a few plants. I plan on moving as many as this 50lb bag of LECA will allow, see how it goes, and decide what to do from there.
Below is a picture of a seedling I deflasked a few months back. It has been growing in sphagnum. I moved it to s/h on 11/10/11 so it has been there for 17 days. You can see the roots look great and are already starting to elongate. The newest leaf hasn't slipped a beat. This is potted in an 8oz beer cup. I like that they are clear.