I'd just like to concur with Ben MacDonald regarding encouraging folk to participate in DNA projects. I too joined the Clan Donald Project at Familytreedna and have been rewarded with several new genetic cousins.
I am R1b as well, but as the project administrator said ' you have an unusual and distinctive signature'. This groups me with some MacDonald's from Skye, one possibly from Barra, a Buie from Jura (once known as the MacDonald Buies of Jura) and another from Caithness like myself. I also have a whole clutch of McNeil's from Barra in my grouping.
I am currently awaiting some further tests (SNP tests) which might help us understand whether our group are of Viking (eastern European) or perhaps Pictish or even O'Neill origin.
I believe as more folk decide to participate some brick walls will be broken down, new and interesting questions raised and some clan histories will perhaps need to be rewritten.
It is an exciting time to get involved in DNA research and at least in my own experience well worth the investment.
There are various companies to choose from and already many clan projects up an running. Just search on google.
So I join with Ben in saying,
'There are many possibilities regarding the DNA results. I would like to encourage all Clan Donald members to participate in the Donald DNA test. It will help unravel family genealogies such as mine'