What are the pros and Crons of Watir? Testing Interview Questions

Here are the advantage and disadvantage of Watir.
Pros: 

• It’s a Ruby library
• Multi browser (& OS) support
• Has a rich API
• Has a ‘Simple’ class (for non-tech users)
• Watij & Watin (Java & .NET)

Cons: 

• Have to learn Ruby (unless you choose Watij or Watin)
• Every browser requires a different library