Vectrex is one of the classic game consoles - a 6809 based unit that set itself appart with vector graphics and a small internal CRT. They are apparently very rare now.
Vectres Regeneration is a Vectrex "console"for iOS was just announced and is now available on the AppStore. One of the original games (Mine Storm) and a few indie games are on the free version and a $6.95 in-app purchase adds many others. (the price may be discounted as an intro - I've seen it listed at $9.99 elsewhere). A short review is here as I've only been using it for 15 minutes on my iPad 3..
We are lucky enough to have an original Vectrex console in mint working condition with numerous games and overlays. I managed to get fairly good with the interface and have ok scores in many of the titles. I'm spoiled.
The graphics seem reasonably authentic, although they don't capture the exact look of the original - but close enough and probably fine if you haven't played with the original. Sound is just fine and there is an online mode for multiplayer play (turn taking).
The problem is the virtual game pad. While you can configure positions of the control stick and buttons, it isn't a physical object and lacks the "feel" I need causing the user experience to fall apart.
The game comes so close.
If you have a real Vectrex (maybe a couple of people out there), I'd pass on it unless you have a physical game unit for it. It is apparently compatible with the iCade (which I don't have) if you buy the game pack. I've never used an iCade (about $100), but have heard good things about them and they are probably very useful for people who want to play classic computer games on their iPads. I can't imagine this working on an iPhone given the tiny screen and just didn't try...
So if you have an iCade, give it a try. Dave ... I'm waiting for you to get one to tell me how well it works...