I recently had my y-dna (37 marker) tested at Family Tree DNA and had a wonderful experience. "I2a1b" is my y-dna haplogroup and I matched one of the Clan MacFarlane unassigned lineages. This finding was significant because my grandparents were convinced we were clan Gunn because someone Scottish Gift shop person told them so. I disproved it with genealogical research but hit a brick wall in the 1700's. They have my sample on record and I can always order more tests like mt-dna.

I strongly recomend this for the clan y-dna projects purposes and to help in the area were one gets curious about there older ancestral connections. As stated it is very helpful when a brick wall has been placed in your path and you're unsure about a possible clan connection. The DNA doesn't lie.