Pretty pastry shops are deceiving. The desserts look great in the display case but for the amount you pay I'd say skip it and save your money for buffet instead. A case of 6 mini macaroons costs $15 and if you go to Wicked Spoon at Cosmo or Bacchnal Buffet at Caesar's Palace you can get unlimited full size macaroons. If you're staying at MGM it's conveniently located right next to the elevators as you exit, but I'd rather go to Starbucks and get a morning pastry then go to a buffet later.
I tried the almond croissant and it was good but nothing special. The coffee was decent too. I also ordered a boston cream pie cupcake but ended up giving it away to the taxi driver. Just because it's wrapped in pretty packaging doesn't mean it's amazing.