I don't know if the Exclusive Brethren are the same as the Plymouth Brethren. I know a few Plymouth Brethren. When I left the JWs one I know knocked on my door with some of their tracts trying to convert me. I had to laugh at the irony of it.
Our house used to belong to members of the Plymouth Brethren, it's semi detached so I guess the neighbours must have been too.
Where I live, the Plymouth Brethren children are always put with the JW children during christmas activities and religious assemblies at school.
They don't like TVs, computers, radios etc. The females (even little toddlers) have to wear headscarves, have long hair and never wear trousers. The children are taught at home once they reach secondary school age. The men stand in our high street on a saturday shouting out about the bible, everyone tries to avoid them!
Despite their strangeness, the ones I know are generally a very nice group of people, they really care about each other and are very close knit. The children are really lovely and well mannered. But they definitely won't convert me - sorry Jo! (not that she'll see this cos they don't like computers! lol)