So how has your gear changed and why did you change it?
Interesting post.
Biggest change is addition of lots of gear. But, looking strictly at what I started with, and what I use now:
Mask: started with an Ocean Master View 3 purge. Big, expensive, single lens, large volume purge. Now use SeaDive Caribbean. Small volume, dual lens, inexpensive. Still have Ocean Master in a box in the closet.
Fins: Mares Quattro. Still use them for all recreational diving. Original pair were stolen in 2010 (9 years after purchase). Bought an identical replacement pair. Now have JetFins for doubles.
Exposure suit: Henderson 3mm full suit. Now have two Henderson 3 mm suits (not original, which was stolen), but have added pockets. Plus added drysuit, and 5 mm suit.
Snorkel: Sidedraft original. Now have two, but not original (which was stolen).
Reg: Original was Zeagle 50D with ZX second stage. Still have it and still use it as my primary recreational single cylinder reg. But I have multiple other singles and doubles regs (including 8 more 50Ds, plus a bunch of Apeks regs, all of which I like equally well).
Cylinder: AL80 was first cylinder. Still have it, but it is used now as a deco bottle. Moved to single 120, then double 120s, then double 100s, double 80s, double 130s, etc. Favorite single cylinder is now HP100, but I still dive single AL80 and single HP120s.
BCD: Zeagle Ranger was first BCD, now dive SS BP for recreational and technical. Still have Ranger, and now dive it again (sat in a closet for 8 years) every once in a while.
Light: First Light was a pistol grip C8. It was stolen. Now use a 10 watt can light and multiple LED back-up lights.
Weights: First system was weight-integrated, now use weight belt.
Knife: started with blunt tip 8 inch straight knife. Now use EMT shears and 1 inch folding Buck Knife back-up.
Computer: Vytec for 8 years, then added Nitek He, then Liquvision X1. Sold Vytec and bought (used) HeLO2.
Reels: started with (cheap) Trident reel, replaced it with several used Dive Rite wreck reels anf Halcyon spool.
Financial ststus: started out solvent, now. . .