TBH nappyaddict i can't remember if he did it from the start. he did play with it more than anything at first, but probably because he didn't have a clue what it was, but i know he was properly breaking off chunks of banana, carrot, pear etc. way before 26 weeks - definitely competent at this by 24 i'd say. we celebrated 26 weeks with his first roast dinner and he managed to break off bits of roast beef and yorkshire pudding and chew and swallow quite happily, so he had clearly worked out how to break off bits of food long before then if he could do it with chewier food quite happily at 26 weeks.
as i said, he was an early developer on the sitting front - proper ramrod straight back, no support from hands etc. from 21 weeks, and no sign of tongue thrust reflex being present etc. so i think he was slightly ahead of normal curve. maybe 22 weeks was a little early but we probably weren't far wrong (a week or maybe two out at most, certainly don't think we were 4 weeks too soon).
FWIW, I'm pg with DC2 and fully intend to go to 26 weeks, but will see how DC2 is developing. had no intention of weaning DS sooner, but i knew what to look for and it seemed like he might be ready. that was part of the deciding reason to go BLW - felt if i did puree at 22 weeks then i wouldn't know if he was really ready, but BLW was much more about him being physically capable.
i don't recommend weaning earlier to friends, but if they ask my experience i tell them about DS, and do tell them to e.g. not do it if tongue thrust still there, child not able to sit unaided etc. i make it clear that i owuldn't have weaned then if he couldn't do these things.