I took a look. It is pretty expensive and very, very centred on American families although I found many French as well. Searching, below the surname level is very tedious. With the exception of a legendary aunt who allegedly dumped her two kids and ran off to America with a sailor my ancestors stuck to England. As far as I can see I am the only one who ever ventured overseas and I did that for nearly 40 years.
I have several quite rare surnames in my tree and have yet to receive a single reply of significance to any posting I have made on American-centred sites. I have had several from UK sites. I am not a hugely experienced researcher but I have found at least as much benefit from Rootschat as from all others combined.
There are very few Nethway or Murrill names around - both surnames are rare in this spelling. I also research Damary. I suppose all of the English Nethways, most of the Murrills and a quarter of the Damarys are related to me. I had one significant contact from Genes Reunited about Damary. The various American boards, although supposedly world-wide, have produced only the most simplistic replies - suggesting lines of research that my posting makes it obvious that I have already tried. I did find on Rootsweb a good detailed collateral family line that enabled me to go back several generations on one of mine. But any attempt to make contact with that researcher was useless.