Well all the bad things I heard about... I just won't say due to lack of proof and no more bad rumors need to spread.
As goes for the experiance I have..... goes as follows (good and bad)
Good
Bought a Machined block that was done CORRECTLEY.... Paid roughley $1,000.00 That included a main Girdle and local tax. ( I was pressed for time and they had me bent over)

My bad no one elses.
Bad..
The pistons that I have seen enter the machine shop where I worked, that were "DSS" were not as good as Production Forged pistons. The factory forged pistons that came on the 87 to Early 92 Mustangs were better. Now I havn't seen their stuff as of late but the rumors are still going strong on variety of things. (I am not sure or can prove such things with-out investagation but not worth my time anymore.)
When ever I tried to deal with them, I always got someone there that always was cockey and knew everything.
I even told them about a particular combo at the time and asked there opioion on it. They said it would never run in the 12's. Combo was your basic GT-40 heads, Intake, 70mm throttle body.C&L, E-Cam, 1 5/8 Ful Length Headers, 5-Speed, 3.73 gear, etc. Car ran 12.50's and they said I was Full Of shit!
They even said that the TFS stuff is Junk, when they first came out and after the guides were fixed. Maybe they are different now but I lost all respect and wouldn't give them the time of day again! I wish it could be different because they are so close (I even gave them several chances) and the out-come has always been the same.

come