If you're interested this is a good review of the current (as of 2012) evidence re blw. It's from the NIH so highly reputable. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3509508/
The bottom line is that there does still need to be a randomised control trial to determine if the anecdotal benefits of blw hold true. However, the observational research done so far suggests that blw may lead to better self regulation of food intake.
One thing I think it's worth mentioning, I actually know very few people who honestly took a strict one style approach (eg blw or puréed/spoon feeding). Most people, myself included, do more of one but do do bits of both. So yes, I would say I did blw. But on nights when dh and I had soups or bolognese there was definitely some spoon feeding for dd. I also spoon fed yoghurt and pouches of puréed fruit at times.
I also think blw has been around longer than we realise. It just didn't have a fancy name. My aunty's approach to weaning in the 80s was "when they reach out and take it from my plate, they can have it. Sounds very blw to me!