Yes still seems very solid. The was one guy in the early 2010 days on Bitcoin talk using 1000 instances(pc back then), or claiming to do so,and did not succeed.

Yes still seems very solid. The was one guy in the early 2010 days on Bitcoin talk using 1000 instances(pc back then), or claiming to do so,and did not succeed. The difficulty is now still many millions times more than it was back then.