I think it's easy to confuse the Core with the Tech computers it looks much like, and Suunto's marketing are clearly pushing it as a sort of "cross over" computer.
But, IMO, it's not a Tech computer, but it is a REALLY good Rec computer. Big, clear colour screen, big buttons, easy to navigate menus, easy to set up, a decently configerable display where you can configure exactly what YOU want to see on the screen, the AI is for me so far perfect, no drop outs, and can link to multiple transmitters (although no easy way of showing multiple pressures at once currently).
It's also reasonably compact, has been pretty tough, and the pricing is just about ok for what you are getting (the transmitters are expensive when bought on their own)
Battery life is good, charging easy with the magnetic USB cable too.
As someone who has no interest in wearing a "dive watch" style computer i think the Core is a pretty good option. Yes, the Deco algorythm is proprietry, no you can't change it (other than turning deep stops on/off and having a few selections for conservatism that effectively trim the stop times ) but for Rec diving, it'll keep you safe, and that's frankly all that matters really.
It's also simple enough that for those divers that don't want to get bogged down in Deco theory and have to read a 100 page manual just to turn the thing on, they can pretty much just strap it to their wrist and jump in, and that is probably more important than many of us divers on here consider it to be for a lot of Rec divers