No need to use this.
I tried WinAce several times, especially in the beginning of the WinZIP and WinRAR rising period, but anno 2008 I don't see any need to use this. It's format (.ace) is nearly used, it's interface is very sloppy and old fashioned and the installer seems to install some spyware in the background (but that can be misjudged). It misses much features competitor WinRAR does have.
When you want to try something else than 7Zip, WinZip or WinRAR.
Is this product still alive? There seems to be no activity on their website
Format .ace is nearly used
Sloppy interface (too much windows, old icons)
Spyware during install? More
A compressor with one of the highest compression ratios available