I remember reading today / yesterday that someone had problems with Wingz on a 48MB system... I just downloaded both Wingz and WingzPro, installed them in under 5 minutes and both run very smoothly and quickly on my 32MB 200Mhz Pentium I running Slink... The Excel and HTML import / export functions seem to work flawlessly... Gnumeric (at least the version packaged for Slink) has a LONG way to go before it comes close to this (excel compatiblity is very nice when your colleagues all work w/ macs or windows)... I too did not see a shareware request for $50 (but haven't poured over the docs yet - maybe it's hidden somewhere)... I also haven't really been able to tell the difference between the Wingz and the Pro versions....
Just my 2 cents on a seemingly pretty cool program (so far, anyway)