This is a great deal, I especially recommend Ayita Pro which is my go-to font for spreadsheets (ttf version).
A lot of great fonts in here: Charter ITC, DIN Next, Trade Gothic, to name a few.
The desktop versions are all OTF. The Webfont package at the same price includes WOFF,EOT,TTF,SVG, but not OTF.
I have personally found that TTF versions look better on Windows systems, but do not often have all the bells and whistles a OTF versions do. So choose accordingly.