"nemrod - have you dived in those two old sets lately?"
Define "lately", last weekend no, last summer yes! I don't live near a coast right now so my diving is limited compared to in the past but I get in the water numerous times throughout the year. The "vintage" set is being readied for some diving this coming season, the "classic" set is my main dive gear. Look, I got tons of gear, these are just representative of my stuff. I have a new set going together--slowly----consisting of soon a Hammerhead BP, a Halycon wing, new Mares Proton Metals etc. I hate to tell folks but those Teknas in my "classic" set at depth and working hard are diffucult to beat. Shallow they are jumpy and quirky, still, I like them. The Mares MR12 and a Voit MR12 sets are my backup regulators. Unlike the jackarse in the movie "OpenWater", when I go diving I have backup gear so I don't loose a dive or have to bum gear and cause a ruckus.
And nope, I don't use a computer, past, present or future and often I don't use a BC either. N