McCormack preamp upgrade, Is it worth it?

Consider the change going from a stock ALD to a Deluxe, then another order of mangitude over that. This is what I'd expect from a Rev. A, but no I haven't heard so I can't say. What I *can* say is that going from a stock TLC-1 to a Deluxe was quite a jump, same as was going from a stock DNA-1 to a Deluxe. These were both significant strides in "value for the dollar". Considering what you could get for your used ALD + $800 is it realistic to believe that you can better *that* for the money? I believe the upgrade would be worthwhile costwise.

Hi Abe I'l try to recall the differences but this may not be completely accurate:
All of the I/O jacks are upgraded from (stock whatever) to Kimber, except that both pairs of output jacks & the Aux. input jacks are now Cardas. Some of the internal discrete components are also improved quality (wire, caps & resistors) tighter tolerances & better noise performance. Steve McCormack can more fully explain & it is worth taking the time to phone him at SMC Audio. The standard/deluxe price difference at retail level is about $300.
I don't know if SMC will upgrade from a stock unit to a deluxe but they will upgrade to various Rev. levels: C, B or A. The C level may be most comparable to a factory deluxe model & it gets even better from there.
I must say that the TLC stands up to its name; Transparency. These units are quite an accomplishment in value for the $.