My instructor keeps around several Titan regs as loaners. He also recommends these regs to his OW / AOW students that are looking for a good, safe, inexpensive regulator for rec diving.
The Titans are:
1) relatively compact
2) very durable
3) servicable just about anywhere around the world
4) inexpensive
IMHO, the Titans are not junk. But, of course, there are better regulators out there. Everyone would agree that the Apeks ATX200 is a far superior regualtor, but for $650 (as opposed to $170 for the Titan), it had better be.
I've dove my instructor's Titans for about 4 months, before I made up my mind and purchased my own regs (Mares V16). My Mares reg does breathe noticably easier than the Titan, but, I don't think I have gained any significant bottom time as a result.