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@BringMeMyFix
Depends on your needs really. The advantages of the upgrade are saving up to ~200g in weight (not a lot), and having tubing shapes that will resist torsion a little more under extreme forces; and prettier welds, if that matters to you.
I've got the T (the forerunner to the T2), and the RC2, which uses similar tubing to the TK2 (bulged TT near HT junction, ovalised downtube). The former has mudguards on all year round, and also gets used on the turbo. It's not exactly a noodle, but having raced a few crits on it, it slightly lacks the direct steering of the beefier tubeset, as you'd expect. These differences are only really noticable when throwing the bike into corners very hard, or accelerating in a big gear out of the saddle.
I've descended at >40mph on the T(2), and felt fine, and seem to remember being well ahead of all the titanium and carbon folk the last time we climbed the 18% Whitedown on the TNRC. So it's a capable machine.