Good Mac OS X 10.7+ chess program?

Why use some clone insted of the real deal? Use Chess.

Chess.app can't do a lot of things I'd expect from a proper GUI:

-setup the board anyway you like

-have any time control.  (the engine has a fixed max to adjust dificulty but not for the player or players)

-play online on telnet servers

-load games (though it saves them as .pgn which is useful)

-analyze games

-show the engine PV

-run variations

-play any engine other then sjeng (I've tried pluging in other xboard engines and renaming them)

-play any variant (even though its engine does)

And lets face it, a 3d mouse driven interface on a computer monitor is lousy to play on.  Its easy to miss moves.

Other things xboard can do:

-engine vs engine matches

-run engine torunaments

-edit opening books

-support UCI and all its dialects for variant engines

So forth...

I have no idea what you mean by clone.  Chess.app is ment to be a demo app for OSX, nothing a serious chess player would look for.  And Xboard as a project has been around since the early '90s

Copyright notice in the XBoard source code says it is from 1991. Of course the present-day XBoard differs as much from that first version as a Space Shuttle differs from a Ford Model-T.

But what I get from your post is that Chess.app on that scale would look more like a bicycle...

Scid + StockFish or Critter + IcofyDatabase with 5 M games (you can filter for a new base +2300 years 1970-2014 or more new games year 2000-2014). In the past I pay for chess programs like Fritz versions and I use Windows. In the last 3 years i use Linux + this free combo and I very happy with them. 

My point is simply that it can't be a clone, because it came first. :)