I just got my T2 upgraded to a T2x. While i have not tested it out yet, I never regretted buying the T2. Weight reduction is superb especially when you lug your equipment around or check it into some budget airlines. I had close to 250 dives over 2 yrs on my T2 before sending it in for the upgrade without a single problem, no leaks, no trickling of bubbles, no wet breathing, it performed just as it was advertised. Extremely reliable piece of hardware. All my dives were sea dives. I compared the T2's filter with my buddy's B2 (70+ dives over 2 yrs), and we did see how Titanium performed. Mine had hardly a tinge of green while the B2 had the usual sign of corrosion.
The most important factor, is the post sales service that Atomic renders. The service dealers where I am based at, are a bunch of fools. No one has heard of the T2x, nor do they know which parts of the SS1 exactly are Titanium etc. Idiots. So I emailed Darcy about sending my reg back to the factory for upgrade and servicing. I asked a hell lot of questions, technical questions about length of hoses etc. She answered them all promptly and professionally. That to me, is what you get for paying so called 'premium' prices for Atomic regs. T2, no regrets.
And once again, thanks Darcy!