I've got a few of the Ligurians from Stephen on KI at the moment. I've had mixed results with them, and I can't comment on why some of them haven't performed as well, but I'm guessing its got more to do with local stresses and conditions than variations in the strain. For example, poor hive placement and exposure to disease. They also could have superseded without me noticing.
On the other hand the ones that are performing well are perfect. Very strong hives, very steady on the comb, produce well, and are very docile, even when I've thrown them around a bit for some major hive manipulation.
In conclusion, I'll be getting them again. So will some friends of mine.