I have the newer 44c and it's been fine. You pay a *lot* for that RT bit in the name.
Full disclosure, I have the sE RT tube mic but got it for about 50% off - it's a very nice piece of gear, but when you start paying that much extra (i.e., what I did not pay, or the difference between the 44 and RT4) for a name, you should be sure it's delivering something specific that you are looking for and know it will deliver. Same goes with signature guitars, whatever.