I paid the $25 for Sniz Leopard and installed it last night. I bought it only for the much hyped Exchange integration features.
Seems to work fine so far. I now have access to the Exchange server's address book, which is the only part of Exchange that seems useful. The appointment alerts work in iCal, too.
Some day before I die I hope Exchange will cease to be thought of as indispensable. That will be a good day. There are plenty of alternatives but in 2009 it is unthinkable for most companies to ditch Exchange for anything else. The reasons for keeping or deploying Exchange are primarily based on FUD.