Good Construction and good quality - just not for me.
The AT 510 looked very good and since they were Thomas I decided to go with the new 510s rather than the AT 505 I had been using.
The AT 510s carry less distance than the AT 505s. The 510s will not allow you to work the ball. The 510s have a clumsy feel and the short irons are really awful out of medium rough, worse than that out of tall rough. All the 510 irons play bad from tight lies. I will just call this my $400 mistake for this year.
If you are considering Thomas irons buy the AT 505. I did get regular shaft irons that I really like Ping G5 with Ping Tour W wedges.