Related Clues:

• First-rate
• 'Wow!'
• Outstanding
• Capital
• Extremely good
• Very good
• First class
• Of the highest quality
• Wonderful
• Really good, top class
• Superior, of the highest quality
• Superior, first class
• Quite splendid, extremely good
• 'Superior, first class (9)'
• Not given XL, by the sound of it, couldn't be better