Comment on Numbers

About 6 months ago I decided to stop using Excel and start using Numbers exclusively, it took me a while to adapt, but now I'm very happy with Numbers and I've only had to fall back on Excel when dealing with relatively large csv/xls files (>2MB).

I'm still a bit confused about the interface. I don't understand why we should sacrifice horizontal spreadsheet real estate for the worksheets and styles column and the inspector. It's a little cramped on my macbook.