My rationale for owning a T2.
1. I buy the best I can afford in most activities I participate in. Why should I settle in diving?
2. It's 7/10ths of a lb. lighter. I fly everywhere I dive and carry-on my regs. As well as u/w video gear and other stuff. If domestic airlines ever start checking carry-on weight, I'm almost certainly over. It's also advantageous on overseas flights since carry-on allowances are often less. After multiple flights it maybe makes lifting my roller bag slightly easier. I bought a lightweight bag for the same reason - why not maximize the result with lighter gear.
3. My w/i BC/tank end'od off a tailgate recently - the yoke on the knob side took the impact on a concrete curb. Wasn't even scuffed. 5mins. later I dove it. Would a chrome over brass 1st have had the same result? Or would it have bent since Brass is softer? Probably not but IDK...
4. Ti is lighter and doesn't corrode - afaik never. I only dive saltwater so that's a consideration. I also plan to be using this reg for a long time - my previous chrome/brass 1st pitted after some years.
5. I'm terrible about maintenance. On a couple of occasions I've left my gear until weeks after I returned from a trip. The T2 looks as good as new. The last time I had it serviced the tech told me the only reason he changed the parts was since it was already apart.