If you want a reg that you can beat the **** out of and still have it work like new, buy a Sherwood. IMHO their regs don't perform as well as high end regs, but they cost a heck of a lot less. I've had a Blizard down to 150 fsw and it breathed as well as on the surface. The only complaint I have about sherwood regs is that they tend to breathe wet, especially upside down.
Trek fins are trash. On that I can agree with your friends.
Sherwood BCs are very similar in quality to most BCs on the market. They're also cheaper than most BCs. I don't like most BCs. Sherwood is no different.
Anyone who says that Sherwood is trash is just being influenced by the price tag.
Ever notice that most rental regs are Sherwoods. That's because they will take more abuse than other regs.