Hi Kaaos,
I'm not sure if the Shanling you heard was a stock unit with the Chinese tubes it ships with, as you didn't say... but everyone seems to agree that the stock unit is nothing compared to a unit with a minimum of having the tubes upgraded to the Western Electric 396A's. From there forward, the T100 seems to posses some remarkable qualities which only continue to impress as additional upgrades are added.
As far as the stock unit goes, from a number of T100 owners who have responded to my inquiries, a couple of aspects to the soundstage seem to be present with the T100 which I feel is lacking in my Ah! 4000 beginning with this first upgrade, and that is more 3-dimensionality and palpability to the instruments and performers.
For that, I'm willing to try a T100. While I'm sure the already modded APL3910 may well better a stock T100, I'm talking about an entry point of around $1,000 - $1,200 for a used T100... not $5K for an APL3910 http://www.aplhifi.com/product.html (I have no idea what they might go for used or if any can be found)
A fully modded T100 is in the class of $10 - $15,000 units a number of reviewers have noted, and to get it to that point the mods range from $1,000 - $2,650... still less than what an APL 3910 seems to go for.
For the money, as well as the sound to dollar value, I think I'm pretty safe going with the T100... plus I get the stunning looks on top of it.