MS Office style controls

[Haldir]

I’m making a complicated office system for my client and I’d like to find a class library, which would allow me to add MS Office style controls into my system. I ran an internet search and found the following information:
http://www.prof-uis.com/Overview.aspx
This Prof-UIS tool looks attractive to me and I’d want to know if somebody have tried it and what are your impressions about it. Or have you worked with another library with the similar features.
Thanks.