Saw no leaks in either of mine Barry - I have the 4 berth which Debby used and the 6 berth which I was in. I do have the flysheet for the bigger one.
I bought back the bigger one (10 x 8 I think) from Florida last year, got it on Amazon at a really good price ($117.58, delivered to a Florida resident) but had to pay for an additional piece of luggage. it still worked out considerably cheaper than buying it here. I got the fly sheet for about $15, it was a return on Amazon.com.
The smaller one I also got through amazon.com with UK delivery, it hit an all time low price of £67.20 and shipping was £23.36, plus Import fees deposit so the whole lot cost £108.67. (use
http://uk.camelcamelcamel.com/ to track Amazon prices and get alerts)
I had read about them leaking but as I say, haven't seen it yet - and they were used in pretty wet weather last August at a festival. I guess I should treat them with something. They really are quick to put up and take down...